DuPont Kevlar brand fibers at neck and clavicle area for cut-resistant protection HeiQ Fresh technology prevents odor-causing bacteria so you can wear more and wash less HeiQ Smart Temp technology helps regulate body temperature Easy-close adjustable collar for customized fit and comfort Underarm gussets and shifted seams maximize mobility Flatlock seams reduce chafing Stay-put thumb loops keep sleeves in place High-definition gripper print on sleeves help hold elbow pads in place.