New Trimmers provide thermal compression to the area promoting and additional increase in heat and sweating. Made with Premium latex-free Neoprene for Superior heat insulation. The trimmer's grid inner lining will not only prevent moisture absorption but also minimize slipping and bunching during your workout. Includes a premium mesh carrying case M Arm Trimmers 16" length x 5.25" width recommended for arms up to 15" Purchased from Nike Store