Made with a polyester stretch blend, the Arrow Jacket from Mountain Equipment mixes lightweight insulation with mobility to keep us climbing and trekking freely. The fleece-like inner face fabric traps small pockets of air to maintain our core temperature while wicking away moisture when we start to run warm on steep ascents and more technical moves. The full-zip make it easy to add or subtract layers and lets us un-zip quickly for added ventilation during high-output activities. This mid-layer feels more comfortable than a traditional softshell, and it's more wind-resistant than a typical, lightweight fleece, making it a high-performance layer for climbing, scrambling, and summer mountaineering.