100% polyester; Machine wash cold water on gentle or delicate cycle, line dry, no bleach, do not tumble dry, do not wring out, do not dry clean * Made of lightweight Windshark 4-way stretch, waterproof, breathable windproof fabric * Optimum placement of three heating panels keeps the upper body muscles warm and loose * 7.4V rechargeable lithium-ion battery provides up to 10 hours of comfortable warmth * China