OR's Vigor Quarter Zip Pullover delivers versatile mid-layer performance through its innovative grid-back fleece construction and ActiveTemp thermal regulation system. Engineered for alpine environments where conditions change rapidly, this pullover manages moisture and maintains core warmth without excess bulk. Flat seam construction minimizes chafing during extended wear, while a secure zip chest pocket keeps essentials accessible on the trail. Lightweight yet substantive, it bridges the gap between base layers and outer shells with professional-grade reliability.