PROTONE Air permeable mid layer insulation with abrasion and weather resistant outer surface. Alpine and rock climbing Climbing equipment designed for efficient movement and protection in alpine environments. Lightweight Minimalist high performance design that is strong for its weight. Synthetic Insulation Artificial insulation with fast drying times, durability and retains heat when wet. Proton Hoody The Proton Hoody features a breathable insulation package to handle the dynamic demands of mountain pursuits and perform as a self-regulating midlayer for a variety of high-output activities. Breathable insulation means excess heat and moisture can pass through the combination of air-permeable fabrics and insulation. In addition to being extremely air permeable, the 20 fortius™ 20-face fabric has unrivaled durability, over 60 times stronger in abrasion tests than the industry standard. Coreloft™ Compact 80 Synthetic insulation in the body maintains excellent stretch recovery. No Slip Zip™ prevents the main zipper from opening and the helmet compatible insulated hood gives additional warmth. Put it on, leave it on and stay focused on the task. Size and Fit Advice: Snug Fit: This trimmer is shaped to sit close to the body across the chest, waist, hip and thigh. Its low profile eliminates bulk, moves with the body and fits comfortably under our first layers. The fit of this model has evolved. Before checking out, be sure to refer to our sizing chart to determine the correct size. Size XXS, XS, S, M, L, XL, XXL Weight 320G / 11.3oz Fit Model Measurements Height: 5'7"/170.2cm, Chest Width: 32"/81.3cm, Waist: 25 "/63.5cm, Hip: 35"/88.9cm Wear Size: Small Sizing Chart Women's Sizing and Fit Guide - Tops Activity Rock Climbing / Ice Climbing / Alpine Climbing Model X000006560