Upper: Breathable-waterproof FUTURELIGHT™ membrane / Made on an updated D-width last that accommodates a broad set of consumer foot shapes Sole Unit: VECTIV 2.0 rockered midsole offers a forked heel and forefoot and a TPU plate for increased lateral displacement and stability / Rocker midsole geometry engineered to create long-lasting forward propulsion / Midsole made with premium EVA foam and has a 2 mm greater stack height than the S21/F21 version / Broader platform below foot provides inherent stability / Surface CTRL™ rubber outsole with 4 mm lugs that have been redesigned for durability in high-wear areas