{"id":2046,"date":"2024-01-01T20:19:29","date_gmt":"2024-01-01T19:19:29","guid":{"rendered":"https:\/\/mindthebed.com\/which-comforter-is-the-warmest\/"},"modified":"2026-10-21T09:16:21","modified_gmt":"2026-10-21T07:16:21","slug":"which-comforter-is-the-warmest","status":"publish","type":"post","link":"https:\/\/mindthebed.com\/en\/which-comforter-is-the-warmest\/","title":{"rendered":"Which duvet is the hottest?"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_89 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Content:<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #003f73;color:#003f73\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #003f73;color:#003f73\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/mindthebed.com\/en\/which-comforter-is-the-warmest\/#Which_warmth_class_of_comforters_is_the_warmest\" >Which warmth class of comforters is the warmest?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/mindthebed.com\/en\/which-comforter-is-the-warmest\/#The_technical_explanation_of_heat_classes\" >The technical explanation of heat classes<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mindthebed.com\/en\/which-comforter-is-the-warmest\/#What_is_a_Tog\" >What is a Tog?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mindthebed.com\/en\/which-comforter-is-the-warmest\/#What_is_fill_power\" >What is fill power?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/mindthebed.com\/en\/which-comforter-is-the-warmest\/#What_is_the_impact_of_padding_on_the_heat_experience_of_a_duvet\" >What is the impact of padding on the heat experience of a duvet?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/mindthebed.com\/en\/which-comforter-is-the-warmest\/#How_does_bedroom_temperature_affect_your_choice_of_duvet\" >How does bedroom temperature affect your choice of duvet?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/mindthebed.com\/en\/which-comforter-is-the-warmest\/#Sleeping_with_a_window_open\" >Sleeping with a window open?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/mindthebed.com\/en\/which-comforter-is-the-warmest\/#Which_duvet_is_hottest_conclusion\" >Which duvet is hottest: conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Which_warmth_class_of_comforters_is_the_warmest\"><\/span>Which warmth class of comforters is the warmest?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n<p class=\"wp-block-paragraph\">Which duvet is the hottest? The answer to this question is seemingly very simple. After all, comforters from heat class 1 are seemingly always the warmest. However, before you get busy with this information, it is best to read on because there is more than just heat.     <\/p>\n\n<p class=\"wp-block-paragraph\">Thus, ambient temperature, the insulation of your bedroom, the properties of a quilt and your personal preferences also play a very powerful role. Dive into the wonderful world of duvet offerings and the theoretical explanation of how heat classes are created? <\/p>\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"The_technical_explanation_of_heat_classes\"><\/span>The technical explanation of heat classes<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n<p class=\"wp-block-paragraph\">The classification below divides insulation capacity into 4 heat classes. We are looking for the thermal insulation of a unit area. In technical jargon, we call this thermal resistance. In England, the so-called <a title=\"Tog explanation via Wikipedia\" href=\"https:\/\/en.wikipedia.org\/wiki\/Tog_(unit)\" target=\"_blank\" rel=\"noopener\">Tog <\/a>was developed for this purpose. In the US, this insulation is expressed in Clo.     For your information, 1 clo = 1.55 Tog. Specific to down, we also look at fill power. <\/p>\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Heat Class<\/strong><\/td><td><strong>Ambient temperature outside<\/strong><\/td><td><strong>Seasons<\/strong><\/td><\/tr><tr><td>Heat Class 1<\/td><td>Average 4\u00b0C or lower<\/td><td>Very cold winters (11 &#8211; 13.5 Tog)<\/td><\/tr><tr><td>Heat Class 2<\/td><td>Average 8\u00b0C<\/td><td>Cool winters and autumn nights (8 &#8211; 11 Tog)<\/td><\/tr><tr><td>Heat Class 3<\/td><td>Average 12\u00b0C<\/td><td>Mild winters and spring and autumn nights (6 &#8211; 8 Tog)<\/td><\/tr><tr><td>Heat Class 4<\/td><td>Average 16\u00b0C or higher<\/td><td>Warm summer nights (2.5 &#8211; 4 Tog)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_is_a_Tog\"><\/span>What is a Tog?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n<p class=\"wp-block-paragraph\">Tog is a unit of thermal resistance used to measure and classify the insulating properties of duvets. A higher Tog number represents better insulation and more warmth. Tog values usually range from 1 (very light) to 15 (very warm). Nice and easy, right, if you can just measure the thermal resistance? Yes, indeed! However, the story is not quite complete, because this doesn&#8217;t yet measure whether a duvet is truly insulating. Especially for down duvets, for example, this insulation value, fill power, or CUIN value is extremely valuable.       <\/p>\n\n<p class=\"wp-block-paragraph\">The Tog value is very well known in Great Britain and the British Isles, but it is hardly used anymore in the Low Countries and, by extension, Western Europe. Many manufacturers create their own interpretation. That makes it less easy for you, as an interested consumer, to make a good comparison. Often, a warm duvet is also called a 4-season duvet. Thanks to attached snaps or buttons, you can use these duvets together or as separate duvets. A warmer section for the shoulder seasons and a lighter section for the summer. Together, they then form the very warm winter duvet.       <\/p>\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_is_fill_power\"><\/span>What is fill power?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n<p class=\"wp-block-paragraph\">Fill power is a scientific yardstick to measure the quality of down. The higher the fill power, called the CUIN value, the better the quality of a duvet. Simply put: at the same fill weight, down with a high CUIN value retains more heat. More air is retained and that insulates better. You also see more volume and often that down is much fluffier. The quilt is noticeably lighter with the same thermal performance. In this example, the best quilt is the one with the highest heat-insulating property at the lowest weight.      <\/p>\n\n<p class=\"wp-block-paragraph\">We should also make a small side note here, because this value is also approached theoretically. In ideal conditions, without humidity, the test is performed several times and then the average is calculated. However, the ideal average humidity in your bedroom is 50%. In real-world conditions, moisture will cause the thermal insulation to be lower.   <\/p>\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_is_the_impact_of_padding_on_the_heat_experience_of_a_duvet\"><\/span>What is the impact of padding on the heat experience of a duvet?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n<p class=\"wp-block-paragraph\">As you can read, it seems simple to determine the thermal resistance and fill power and think that&#8217;s all there is to it. However, we also immediately shared our observations regarding the results. And then there are also major differences between, for example, duvets consisting of natural hair (wool, etc.), down and feathers, silk, bamboo, Lyocell, and synthetic fibers. Because all these materials also have other properties.   <\/p>\n\n<p class=\"wp-block-paragraph\">A duvet of Icelandic Eider down is one of the most exclusive down coming from the Eider duck. The video below also shows the unlikely fill power of this down. Immediately you also understand that it is not the species that determines the down quality. Goose down is no better than duck down, obviously if you compare both within their fill power and other down characteristics.   <\/p>\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Why Icelandic Eiderdown Is So Expensive | So Expensive\" width=\"1080\" height=\"608\" src=\"https:\/\/www.youtube.com\/embed\/Y_ozeboWz-0?feature=oembed\"  allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n<p class=\"wp-block-paragraph\">This leads them to react differently with perspiration or with excess heat. In other words, what are its moisture-regulating, ventilating and heat-regulating properties? And are they hygienic to sleep under, in other words are they washable or at least cleanable? And what about allergies? Are they hypoallergenic by nature or do you really need to wash at high temperatures?    <\/p>\n\n<figure class=\"wp-block-image aligncenter size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"427\" src=\"https:\/\/i0.wp.com\/mindthebed.com\/wp-content\/uploads\/2023\/12\/young-sick-woman-with-flue-sitting-sofa-home-studio-covered-with-knitted-warm-clothes-illness-influenza-pain-concept-relaxation-home-healthcare-concepts-normaal.jpeg?resize=640%2C427&#038;ssl=1\" alt=\"Being cold under duvet\" class=\"wp-image-1734\" srcset=\"https:\/\/mindthebed.com\/wp-content\/uploads\/2023\/12\/young-sick-woman-with-flue-sitting-sofa-home-studio-covered-with-knitted-warm-clothes-illness-influenza-pain-concept-relaxation-home-healthcare-concepts-normaal.jpeg 640w, https:\/\/mindthebed.com\/wp-content\/uploads\/2023\/12\/young-sick-woman-with-flue-sitting-sofa-home-studio-covered-with-knitted-warm-clothes-illness-influenza-pain-concept-relaxation-home-healthcare-concepts-normaal-480x320.jpeg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) 640px, 100vw\" \/><\/figure>\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_does_bedroom_temperature_affect_your_choice_of_duvet\"><\/span>How does bedroom temperature affect your choice of duvet?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n<p class=\"wp-block-paragraph\">The ideal bedroom temperature is around 18\u00b0C. That ideal temperature applies to every season. So that also means during the colder autumn and spring nights and especially during a cold winter. Many people choose to leave the windows in the bedroom open all year round. With regard to humidity and warmth, there are better ways.    <\/p>\n\n<p class=\"wp-block-paragraph\">During cold days, ventilate your bedroom vigorously and long enough in the morning. Then close your windows and leave your bedroom door open. This way, you don&#8217;t let the heat go to waste, and a bedroom usually warms up to about 18\u00b0C. Just before you go to sleep, set the windows ajar or open them. You&#8217;ll climb into a pleasant bed, and your bedding will also have dried well during the day.     <\/p>\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Sleeping_with_a_window_open\"><\/span>Sleeping with a window open?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n<p class=\"wp-block-paragraph\">If you sleep with a window open, then you know you can certainly use an extra warm duvet. Do you get cold easily? Then down duvets or class 1 wool or synthetic winter duvets are a good choice. If you are always too warm, consider heat-regulating duvets such as camel hair, (Texeler) sheep&#8217;s wool, or mixed natural hair duvets.    <\/p>\n\n<p class=\"wp-block-paragraph\">If you want to be able to work with one duvet in all seasons, there is only one choice: a 4-season duvet. You button the two duvets together into one thick duvet. If you take the lightest one off, it is perfectly suited for warm summer nights. The remaining one is more medium-warm and great for keeping you warm during spring and autumn.   <\/p>\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-fe48e5de wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/mindthebed.com\/en\/electric-blankets-the-way-to-save-energy\/\"><strong>Also read: Saving energy with electric blankets<\/strong><\/a><\/div>\n<\/div>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Which_duvet_is_hottest_conclusion\"><\/span>Which duvet is hottest: conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n<p class=\"wp-block-paragraph\">A heat class 1 is clearly the warmest variant. But look a bit further than just the heat classes. Take the bedroom temperature into account. This is strongly determined by the insulation of your house, whether you sleep with windows open or closed, and whether you lightly heat the bedroom during the winter.    <\/p>\n\n<p class=\"wp-block-paragraph\">Also take into account the specific properties of the fillings used for duvets. Down is generally highly insulating and therefore warmer, while natural hairs like wool duvets are highly moisture-regulating and often regulate heat better. <\/p>\n\n<p class=\"wp-block-paragraph\"><strong>Read also:<\/strong> <a href=\"https:\/\/mindthebed.com\/en\/want-to-buy-a-wool-duvet-discover-the-properties-of-wool\/\">a wool duvet<\/a> and <a href=\"https:\/\/mindthebed.com\/en\/want-to-buy-a-summer-comforterwhich-duvets-fit-best\/\">the best summer duvet<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Which warmth class of comforters is the warmest? Which duvet is the hottest? The answer to this question is seemingly very simple. After all, comforters from heat class 1 are seemingly always the warmest. However, before you get busy with this information, it is best to read on because there is more than just heat&#8230;.<\/p>\n","protected":false},"author":36,"featured_media":2025,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[55],"tags":[],"class_list":["post-2046","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-improve-my-duvet"],"featured_image_src":"https:\/\/i0.wp.com\/mindthebed.com\/wp-content\/uploads\/2023\/12\/woman-man-sitting-bed-top-view-normaal.jpeg?fit=640%2C427&ssl=1","author_info":{"display_name":"Marco Achtereekte","author_link":"https:\/\/mindthebed.com\/en\/author\/marco-achtereekte\/"},"_links":{"self":[{"href":"https:\/\/mindthebed.com\/en\/wp-json\/wp\/v2\/posts\/2046","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mindthebed.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mindthebed.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mindthebed.com\/en\/wp-json\/wp\/v2\/users\/36"}],"replies":[{"embeddable":true,"href":"https:\/\/mindthebed.com\/en\/wp-json\/wp\/v2\/comments?post=2046"}],"version-history":[{"count":13,"href":"https:\/\/mindthebed.com\/en\/wp-json\/wp\/v2\/posts\/2046\/revisions"}],"predecessor-version":[{"id":9995,"href":"https:\/\/mindthebed.com\/en\/wp-json\/wp\/v2\/posts\/2046\/revisions\/9995"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/mindthebed.com\/en\/wp-json\/wp\/v2\/media\/2025"}],"wp:attachment":[{"href":"https:\/\/mindthebed.com\/en\/wp-json\/wp\/v2\/media?parent=2046"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mindthebed.com\/en\/wp-json\/wp\/v2\/categories?post=2046"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mindthebed.com\/en\/wp-json\/wp\/v2\/tags?post=2046"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}