The Gill i5 Headwind Jacket is a a dynamic mid-layer that works hard to keep you comfortable. As the temperatures drop, the Gill i5 Headwind jacket will warm up as it adjusts to the external temperature. When things begin to warm up the intelligent insulation releases heat to keep you in the comfort zone. Wear the Gill i5 Headwind Jacket underneath your waterproof for the ultimate performance layering system regardless of workrate or sailing conditions. This “smart” insulation concept means that the thermal resistance (clo value, tog rating, etc.) actually changes according to varying weather conditions. The “thermal gates” or chemical microspaces within the Gill i5 Headwind Jacket create a dynamic structure. During colder conditions, these thermal gates are “closed” and maximum thermal efficiency is achieved. As the temperature becomes warmer, the microspaces start to “open” and allow excess heat to escape. The Gill i5 Headwind jacket features: • Zipped hand pockets • External chest pocket • Compresses down easily to help with stowage • Drawcord hem • Elasticated cuffs • Machine washable