These neutral Y-3 Ultraboost 21 sneakers are crafted with a flexible Primeknit upper. Designed for a slip-on style, they feature a lace-up fastening, round toe, rubber and leather overlay details, BOOST midsole and a Continental rubber outsole with textured tread. On a sluggish morning we know the day calls for a cup of coffee and our Y-3 sneakers. You know, to start things off with a BOOST.