The Royal Robbins El Cap Canvas Vest builds its canvas shell from organic cotton, TENCEL Modal, and elastane, a blend that moves with us instead of stiffening up the way a standard canvas vest does. A sherpa fleece lining backs that shell with layered warmth, so the vest holds up as an outer layer on cool mornings without the bulk of a heavier jacket. What Our Gearhead(R) Experts Are Saying:"I've worn this on windy ridge walks where a lesser vest would let cold air straight through the front, and the snap placket over the zip keeps that gap sealed the whole way up."