Engineered for high-intensity training in cold conditions, this technical vest combines superior Primaloft insulation with premium British Millerain waxed cotton reinforcements for exceptional durability. The 4-way stretch panels enhance breathability and mobility, whilst the regular fit ensures seamless integration with the 5mila jacket system for optimal temperature regulation. Built from high-performance polyamide with elastane stretch, it's the perfect standalone layer for crisp training days or as insulation beneath a shell in harsher weather.