Home » Howler Brothers: Swan Valley Monster Mutation Collar ExpiredHowler Brothers: Swan Valley Monster Mutation Collar admin May 29, 2024 Apparel, Shoes & Footwear, Men's ApparelHowler Brothers SaveSavedRemoved 0 Deal Score0 0 Buy It Now Deal Score0 Buy It Now Howler Brothers presents the Swan Valley Monster Mutation Ltd. Collaboration. Shop the Limited Edition Now!