Vans Knu Stack Platform Shoes The Knu Stack starts with Vans' modern interpretation of a classic 90s silhouette double the height, a puffed up tongue, 3D-molded Sidestripe, 34mm platform height Womens 5.5 Mens 4.0 Sturdy suede uppers. Puffy tongue and ankle collar. Oversized chunky laces. Heel pulls for ease of entry. Signature rubber waffle outsoles