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The Bontrager Thermal Arm Warmer provides essential temperature regulation for cyclists navigating variable spring and autumn conditions. Constructed from thermal fabric technology, these arm warmers trap body heat whilst remaining breathable enough to prevent overheating during sustained efforts. The visibility yellow colourway enhances your presence on roads and trails, improving visibility during low-light conditions and inclement weather. Engineered in extra-small sizing, these warmers deliver a precise fit that eliminates bunching and slipping whilst allowing unrestricted arm movement through the full range of cycling motion. The thermal construction manages moisture effectively, wicking perspiration away from skin to maintain comfort during temperature fluctuations throughout your ride. Flatlock seams prevent chafing during extended wear, critical for maintaining comfort during multi-hour cycling sessions. The stretchy fabric accommodates layering systems, allowing easy removal and storage in a jersey pocket when temperatures rise. Bontrager's thermal technology balances insulation with breathability, preventing the clammy feeling associated with inferior arm warmers. The high-visibility yellow provides practical safety benefits beyond aesthetics, making you noticeably more visible to motorists and other trail users. Whether you're commuting through unpredictable British weather, tackling early-morning training rides, or enjoying seasonal cycling adventures, these arm warmers deliver reliable temperature management and visibility enhancement. The thermal construction ensures consistent performance across repeated washing and extended use.