A warming vest that protects sensitive areas from cold, especially around the kidneys. Lithium batteries attach with snap buttons in designated inner pockets at the waist and power the integrated heating elements. Batteries are sold separately but are compatible with all Lenz lithium batteries. The material is windproof, quick-drying, breathable, and durable, providing maximum freedom of movement and a comfortable body climate. The slim fit ensures direct heat transfer at the push of a button. The collar is fleece-lined. Machine washable at 30 °C. Outer fabric: 84% polyamide, 16% elastane. Lining: 100% polyester.