The FIRSTGEAR Gen 4 Heated Jacket Liner in Small delivers serious warmth for cold-weather rides. This motorcycle heated liner features FIRSTGEAR's latest heating technology. It connects directly to your bike's battery or a Heat-Troller controller. The slim, form-fitting design layers comfortably under any riding jacket. Micro-fleece construction warms quickly and distributes heat evenly. Heat zones cover the chest, back, and arms for complete upper-body coverage. A universal coax connection is compatible with all FIRSTGEAR heated gear. Machine washable and built for lasting, reliable performance.