Wool is a protein fiber from sheep and other mammals. Produced by follicles in skin layers, with primary and secondary types. Contains natural crimp and scales for spinning and insulation. Can absorb up to one-third of its weight in water
Knitted fabric results from inter-looping of yarns or inter-meshing of loops. Weft-knit fabrics are easier to make but more common. Warp-knit fabrics are resistant to runs and commonly used in lingerie
Bed sheet is rectangular cloth placed above mattress but below blankets. Bottom sheet can be flat or fitted with elastic or drawstring. Top sheet is typically flat and placed above bottom sheet
Cotton is 99% cellulose after scouring and bleaching. Cellulose is a polymer made of glucose molecules linked by glycoside bonds. Cotton cellulose differs from wood cellulose with higher polymerization and crystallinity. Cellulose chains are held together by hydrogen bonding between hydroxyl groups
Linen is made from flax fibers of the Linum usitatissimum plant. It's stronger than cotton and dries faster than cotton. The taller the flax plant grows, the longer the fiber. Linen can last 30+ years and is eco-friendly
Pure cotton may contain small percentages of other fibers. 100% cotton fabrics are made solely from cotton fibers. Both types offer similar moisture absorption and retention properties