Years ago we offered the “SL M3,” a perennial bestseller and versatile backpacking boot. The SL Activ inherits the one-piece, Italian-leather upper and classic look of the M3, but infuses our latest innovations to the design. The 37.5® lining dries fast and resists odors – your tent mates will appreciate it! Memory foam surrounds the heel and ankle for comfort. The Vibram® Biometric midsole uses a dynamic TPU shank to provide underfoot support and dual-density PU for fine-tuned shock absorption. Durable and plush, the SL Activ updates our classic backpacking boot.