Originally designed for our Alaskan Ultrasport racers who require frequent fueling. The Hatch features longer neck coverage and has a large front port that velcros on 3 sides. The mask is constructed with our fleece VaprThrm construction providing absolute wind protection with the exception of the front hatch which is constructed with 200 weight breathable Polartec to allow air flow for breathing. Additional features include lycra binding and an adjustable drawcord that secures behind the neck to prevent being lost.
To determine size measure around tip of nose and around back of neck as detailed in the pic below.