Altra goes all in with the Olympus 275 HiLo, a trail runner suited to technical terrain and all-day running. It's made from a one-piece MATRYX® woven upper that's lightweight and protective, with a built-in scree sleeve helping keep debris out when things get a little more rugged underfoot. A Vibram® Megagrip outsole with TractionLug™ provides grip and stability across varied conditions, wet or dry. The big update comes underfoot, where Altra has introduced its EGO™ MAX midsole foam, now 15% lighter and 10% softer than the previous Olympus 275. The 33mm stack keeps the zero-drop geometry Altra is known for, while the Original FootShape™ fit gives your toes plenty of room to move naturally. Original FootShape™ fit MATRYX® one-piece woven upper Built-in scree sleeve TPEE sockliner Altra EGO™ MAX midsole Vibram® Megagrip with TractionLug™ Stack height: 33mm, Drop: 0mm Weight: 274g SKU: AL0A85XY73V