When you need reliable and responsive cushioning for large stair sets, the BOOST foam featured in the midsole of these 3ST.004s is amazing. Not only does the foam absorb impact, it also returns a lot of energy back to you and Adidas was smart in wrapping this in rubber for durability. If you look at the top of the shoe you'll also notice a lack of stitching on the toe-box and vamp; this increases the life of your shoe since there's less to tear when you ollie.