Aggressor Vented Sock. The Aggressor Vented Sock takes Klim's popular lightweight vented sock and incorporates an all-new technical and performance design to keep you comfortable in warmer weather. The highly-breathable, moisture-wicking above-calf design includes knit mesh panels with comfort padding at ankle, heel, forefoot and sole. Added quick-drying performance nylon materials dry eight times faster than cotton and are twice as soft. Blended with acrylic, polyamide nylon, Lycra for durability and comfort (30% merino wool, 30% acrylic, 25% nylon, 15% elastane). Dries 8x faster than cotton. Made of European sourced yarns. Engineered Terry Loop for strategic cushioning and reinforcement. Arch and ankle support stretch bands. Knit mesh panels for breathability. Patterned front mid ankle bend for reduced bulk. Tubular cuff for better fit and stretch recovery.