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British duvets are sold in steps of 1.5 tog from 3.0 tog (summer) to 16.5 tog (extra-warm). The stated values are a minimum; actual values may be up to 3 tog higher. Also, these values assume there is no added duvet cover that can trap air. Adult comfort ratings against temperature.
This enables the purchaser to select a duvet appropriate to the season: the higher the tog rating, the warmer the duvet. A few manufacturers have marketed combined duvet sets consisting of one 4.5 tog and one 9.0 tog. The light-weight one is for summer and the medium one for spring and autumn; snapped together, 13.5 togs is designed for winter.
Clothing insulation is the thermal insulation provided by clothing. [1] [2]Even if the main role of clothing is to protect from the cold, protective clothing also exists to protect from heat, such as for metallurgical workers or firemen.
Fill power is a measure of the loft or "fluffiness" of a down product that is loosely related to the insulating value of the down. The higher the fill power, the more air a certain weight of the down can trap, and thus the more insulating ability the down will have.
Textile fibers, threads, yarns and fabrics are measured in a multiplicity of units.. A fiber, a single filament of natural material, such as cotton, linen or wool, or artificial material such as nylon, polyester, metal or mineral fiber, or human-made cellulosic fibre like viscose, Modal, Lyocell or other rayon fiber is measured in terms of linear mass density, the weight of a given length of ...
It also developed the tog as an easy-to-follow measure of the thermal resistance of textiles, as an alternative to the SI unit of m 2 K/W. The BCRA merged with the British Rayon Research Association to form the Cotton, Silk, and Man-Made Fibres Research Association in 1961.
Typical maximum with current technologies are in 15,000 range. High-performance fabrics may get A1 test scores in 10,000 to 15,000 g m −2 d −1 range and usually shows that a fabric has a fairly quick release of moisture, but may not be the best over longer periods of use.
The flat sheet is tucked in around the mattress over the fitted sheet with the fourth side, at the head of the bed, undone. Some duvet or comforter sets do not include a top sheet; the duvet/comforter has a cotton bottom that replaces the sheet. Fitted sheet: This is the bottom sheet used to fit tightly over a mattress.
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