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Our best-selling Vertx Integrity Base is a lightweight mid-layer piece which can be worn alone or in conjunction with the Integrity Waterproof Shell for the ultimate outerwear combination. Breathable, lightweight and extremely soft, the Integrity Base delivers wind and water resistance via a Nan sphere treated outer shell. The addition of gusseted sides made with Polar Tec Power stretch Hard face Fleece allow for uninhibited mobility while maintaining an athletic fit. Hand warmer pockets and a Savories Suede collar add to the already unbelievable warmth o this ultra-light jacket. The Base can be attached to Integrity Waterproof Shell as a liner or worn separately.