Mammoth TUFF 2025 T-shirt

Design by Randy Noborikawa, inspired by Rob Roskopp.

Registrations before July 13, 2025 at 11pm PST are guaranteed a free shirt.

All registrations after July 13 will receive items as supplies last. If you want to secure a shirt after July 13, purchase your shirt on the BikeReg Merch page to get your size preference as we'll prioritize the merch orders at check-in. BikeReg purchases will not pay shipping and pick-up is in-person. Sizing requests by July 13 will influence our final order count. Thanks for understanding and helping the process.

If you will not be at Mammoth TUFF, purchase your shirt here on Shopify and we will mail your shirt per the shipping details in your order when the inventory arrives.

SHIPPING DATE TBD: We will keep you updated as inventory delivery approaches.