Zerofit Ultimate Heatrub Baselayer LS Grey

The Zerofit Ultimate Heatrub base layer long-sleeved top features technologically enhanced 'Heat Threads' inside the garment that are activated by even the slightest movement, gently brushing against the skin to generate instant warmth, and the construction of the Zerofit Heatrub Ultimate means the heat is retained. Unlike other base layers, the Ultimate does not work on the basis of 'compression for heat' - so not only does it provide greater warmth, but you also won’t feel restrained by an inability to move freely, making it one of Zerofit’s most comfortable base layers. It also features a slightly looser neckline design, which allows some heat to travel away from the body - during testing and development of the Ultimate, a tighter neckline was found to cause some overheating. A rigorous product evaluation at the iconic Boken Institute - Japan's leading testing organisation - resulted in a Heat Retention Rating of 0.78; a standard base layer would have a rating of 0.1-0.14, while a sweater would typically have a rating of around 0.3. Garment construction: Acrylic 68%, Nylon 21%, Polyester 2%, Wool 7% & Polyurethane 2%. Weight by size: XS - 189g, S - 195g, M - 203g, L - 210g, XL - 234g, XXL - 310g, XXXL - 332g. Optimal temperature range: -10° Celsius through 10° Celsius. Sports and activities: Motorcycling, scuba, golf, hiking, equine sports, sailing, fishing, skiing, gardening and workwear.