... ) ratio:30/70,20/80,50/50 ,etc 4)21s,32s,40s,etc Bamboo yarn Feature:1.main Function : (1) releasing negative ions ... infrared; (4) moisture absorption.permeability, quick-drying. 2.Usage: Underdress,T-shirt,shirt,sock,towel,bedding,sportswear and so on.3 ... cotton21s70/30siroSoft Bamboo40s100%SiroSoft Bamboo32s100%Siro4.Color:Grey,black ,white, 32s/1 Bamboo Cotton yarn