The T Aenergy is the big brother of the old Teton Aenergy. Faster, lighter & more durable. The mixed fabric & PU based upper is hard wearing & flexes with your foot. Whilst the tough rubber toe rand protects the front of the boot from scrapes on rough rocks. The boot has a full Gore-Tex lining so it is 100% waterproof & seeing as this is a Swiss design you know it has been built to last. This boot is very similar to the Salomon Cosmic boot, however after 3 months you wont have to bring it back to get it replaced. There is a soft cushioned midsole that absorbs shock extremely well & turns long walks into a pleasurable experience for your feet, even though the front of the midsole has a stiff board for added support on the rock. The sole unit is one of Mammuts own custom designs & has been produced by Vibram, so we know that its going to be durable & grippy. The asymmetric lacing system works incredibly well, as your foot is not symmetrical so why should your laces be any different. A great lightweight, cofmy hiking boot that will keep on going all day long. Base Fit Rolling Concept Memo Foam Hybrid Shell Rubber toe cap Liquid Rubber Protection Soft Shell 3-D Textile Scale Technology Board lasted