SIMMS GUIDE WINDBLOC 1/2 MITT – Constructed from Polartech Windbloc high loft fleece and extended gauntlet to keep the weather at bay. This new Mitt updates the Simms classic with rugged new fabrics and construction. Zoned insulation for extra warmth, rugged Hacksaw Fleece in the palm, heat pack pocket sits against the underside of wrist for warming blood flow to the fingers (heat pack sold separately), new pre-curved design for increased dexterity and improved fit. SIZES: S, M, L, XL.