"Everyday warmth. Effortless value. Meet the Gobi Heat® Sierra Heated Knit Vest — lightweight, flexible, and designed to keep warmth within reach. Built with the same trusted Gobi Heat technology found in our premium outerwear, Sierra delivers dependable heat, a comfortable knit feel, and everyday versatility at our most accessible price yet. Key Features Four Heat Zones – Two in the chest, one in the neck, and one on the upper back for complete core warmth. Simple, Reliable Heat – Powered by the Gobi Heat® 5V 10,000 mAh battery for long-lasting comfort wherever you go. Lightweight Knit Fabric – Soft, breathable, and easy to layer for year-round wear. Zippered Pockets – Secure your essentials while keeping a clean, casual profile. Easy Control – One-touch heat settings (Low, Medium, High) make warmth as simple as pressing a button. Fit & Details Men’s Sizes: S–4XL Women’s Sizes: XS–3XL Color: Onyx Why You’ll Love It Sierra brings core warmth to everyone. With four targeted heating zones, soft knit construction, and a clean everyday design, it’s your go-to layer for workdays, weekends, and everything in between — all at a price that makes heated comfort easier than ever to own."