Altra Superior 4.5 Review | Tested & Rated。Altra Men\'s Superior 4.5 Trail Running Shoe Excellent Preowned Condition Benefits: Balanced Cushioning: - Places Your Heel And Forefoot The Same Distance From The Ground To Encourage Proper, Low-impact Form Throughout Your Run. Footshape™ Toe Box: - Allows Your Toes To Relax And Spread Out Naturally For More Comfort And Stability. Innerflex™: - Grid-like Grooves In The Midsole Allow Your Foot To Flex While Being Lighter, For More Speed And Better Performance. Gaitertrap™: - Hook-and-loop Tab Allows Strapless Gaiter Attachment That Prevents Debris From Building Up Beneath The Shoe. Trailclaw™: - Canted Lugs Positioned Strategically Beneath The Metatarsals To Provide Traction At Toe Off. Maxtrac™: - A Perfect Combination Of Grip, Traction And Durability That Will Eat Up Gnarly Terrain Like A Boss. Quantic: - Quantic™ Was Inspired By A Desire To Combine The Plush Feel Of Altra Ego™ With A Lightweight Ride, It Cushions Every Step And Floats Over Any Surface