Designer Mark McNairy is seemingly everywhere these days, churning out goods from his own New Amsterdam label while he lends his talents on collaborative efforts with the likes of Engineered Garments and Keds. His latest partnership finds him working with Canadian fleece specialist Reigning Champ. The upshot is a capsule collection built around a boxing theme, the assortment made up of a zip vest and sweatpants, both constructed with Reigning Champ's signature 25 oz heavyweight French terry, as well as a cotton tee featuring a Mark McNairy vs. Reigning Champ graphic logo. All three are available now through Haven's webstore.