The Fieldsheer(R) 7.4-volt heated glove liners are one of our top-selling garments designed to fit under any heated glove. Engineered with high-quality stretch polyester, the Fieldsheer(R) powered by Mobile Warming(R) heating technology heated glove Liners are ultra-thin, to have a form fitting design, but provide long-lasting warmth. This glove liner is meant to be worn under your gloves. Please order 1 size smaller to ensure proper fit inside your glove. | Mobile Warming 7.4V Heated Glove Liner in Black | Size Medium