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Heat up. Bulk down. A base layer that combines the best material and heating technology to keep your core warm without the bulk. Three heat zones comfortably warm your chest and back to help extend any cold weather adventure—hunting, ice fishing, skiing, hiking, outdoor sporting events,etc. A compact 7.4V rechargeable Lithium-ion battery provides up to 4 hours of heat output with 2000+ charges. Easily removable heating element system for machine washing.