The Harkila Heat Insulated Waistcoat puts targeted, active warmth at the core of your layering system. Integrated heat panels on the chest and back deliver adjustable warmth via a USB-C power bank connection, giving you precise control over body temperature when conditions drop. As a sleeveless design, it works seamlessly under a hardshell without restricting arm movement, and adds a meaningful warmth boost when worn over a base layer in milder weather. Multiple zipped pockets, a dedicated power bank compartment and elasticated armholes and hem keep everything organised and snug without bulk. Key Features & Benefits Integrated heat panels on chest and upper back - adjustable, targeted warmth for cold-weather outdoor use Horizontal zipped chest pocket left side - secure, accessible carry for everyday items Power button on left side chest and USB-C connection to power bank - simple heat control even in cold conditions Side zip pockets and stow pocket for power bank - practical, organised carry for the heating system Inner pocket - keeps valuables secure and close to hand Elasticated armholes and bottom hem - snug fit that works under a jacket without restriction Heat Control - adjustable warmth via integrated heating panels Thermo Poly Shield - consistent insulation throughout the vest construction Ideal For Cold outdoor days when core warmth is the priority - worn alone in cool conditions or as a heated mid-layer under a waterproof jacket. Why We Love It Easy, dependable and built for everyday life outdoors - a waistcoat that delivers real warmth exactly where you need it, without the bulk. Wash & Care Do not dry clean. Do not bleach. Do not iron. Wash at 30°C. Tumble dry on low heat. Wash separately or with similar colours. Shut off power immediately in case of discomfort. Do not use pins. Do not use if wet. Do not dispose with household waste. Close all fastenings before washing. Size: XS - Chest 90cm (35"), S - Chest 94-98cm (37-39"), M - Chest 98-102cm (39-40"), L - Chest 106cm (42"), XL - Chest 110-114cm (43-45"), 2XL - Chest 114-118cm (45-46"), 3XL - Chest 122-126cm (48-50"), 4XL - Chest 126-130cm (50-51"), 5XL - Chest 134-138cm (53-54")