Description of Marmot Ion Windshirt The Ion is designed for the light traveler: feather weight wind protection that fits in your hand for fast and light hikes, climbs and chilly morning runs. Features: Main Material: Banshee P-170 with Marmot Defender DWR Attached Hood Provides an Extra Warmth Layer Under a Shell Hood or By Itself in Milder Conditions Narrow Elastic Cuff Provides Comfort with Minimal Bulk Ultra Light Construction Lightweight Fabric, Welded Construction and Only the Essential Features Keep This Jacket on the Slim Side. Just 16 oz. for size M Wind Resistant, Water Repellent, and Breathable Zippered Chest Pocket To Secure Small Items