Acceleritas4 is minimalism the Icebug way, a must-have for the adventure seeking off trail runner! The upper materials are very durable with a minimal water pickup. The Acceleritas4 has a midsole construction which enables keeping the weight down (sub 200 grams!) and is very flexible. Terrain feel is remarkable thanks to the low profile of the sole. The shoe promotes the natural movement of the foot, it's like running in a pair of socks, but socks that provide thermal and impact protection, and traction. The outsole is designed with a pattern that is optimized to grip on hard as well as on soft surface, with an aggressive pattern where dirt is steered away to the sides in diagonal channels (it's the same principal as in tractor tires). Acceleritas4 outsole is crowned with the jewel among "sticky rubbers": RB9X. This innovative rubber compound provides incredible traction on both wet and dry surfaces, without compromising the durability!