HydroPur Raschel-Knit Performance Thermal Underwear Bottom is made of 100% cotton on the outside and 100% moisture-wicking HydroPur fiber on the inside to help keep your thermals sweat-free while you are hard at work. Ribbed cuffs help keep ankles in place. Antimicrobial fiber reduces odor. Raschel knit. Tagless waist adds comfort. Specify size: S, M, L, XL, 2XL, 3XL or Tall M?3XL in the drop-down menu above.