The Hot Chillys Womens Peachskins Print Crewneck Combines the soft, light feel and strength of microfiber polyester with an interlock construction to give you warmth without weight and freedom of movement. Interlock knitting is like having a double layer since the two sides are technicaly knitted the same (face out with the backs "interlocked" together) allowing more space to trap air and more stretch than a flat surfaced fabric. 100% Microfiber polyester makes it light for layering Moisture Transfer Fibers to move moisture away from the skin Antimicrobial treatment to inhibit bacteria growth Anatomically designed shape with room to move Soft, silky hand feel makes it easy to layer over UPF 30 protection Seams set away from shoulder for added comfort Set-in collar for added comfort Sublimated print to retain vibrant color and fabric properties