The Killer Hobby BJJ T-shirt is for the practitioners who've learned to lead with the friendly version of that explanation in polite company and save the details for people who ... Most people have hobbies. You have a hobby that involves strangling people. For the practitioners who've learned to lead with the friendly version of that explanation in polite company and save the details for people who train. It's a killer hobby. Technically accurate. You've made peace with it. Makes a great Father's Day gift for the BJJ practitioner in your life. The shirt: Gildan Softstyle 64000, 100% ring-spun cotton, 4.5 oz. Lightweight and soft. No side seams, ribbed collar that won't curl, shoulder tape to keep the back from stretching. Built for daily wear and repeated washing. The print: Direct-to-Garment (DTG), not a transfer, not a sticker. Wash cold, tumble dry low. The print holds. Sizing: Runs true to size. Chest width: S 18" / M 20" / L 22" / XL 24" / 2XL 26" Who it's for BJJ practitioners at any belt level Anyone looking for a BJJ gift that actually makes sense