Bamboo Cotton Blanket. Bamboo Cotton Blanket. These cotton blankets are 100% all-natural bamboo rayon, for the most luxurious feel and performance. Unbelievably soft, exquisitely smooth, and exceptionally breathable--so hot sleepers or nappers stay cool and cold sleepers stay warm and cozy! Long lasting and machine washable. Dimensions: Queen: 98"L x 96"W King: 114"L x 96"W