Extracted from Triple Aught Design Newsletter
This special edition is made using light and resilient dimension-polyant X50, which is 500 denier Cordura nylon hydrostatically bonded to X-PAC Ripstop polyester, yielding an extremely abrasion resistant, waterproof, tear resistant fabric. YKK Uretek water-resistant zippers contract against the Multicam Tropic fabric and help to keep stored gear dry.
Full details available on Triple Aught Design website