In technical terms, Ultra shares a similar blueprint with its closest competitor, Dyneema Composite Fabric. Both are constructed of ultra-high-molecular-weight polyethylene (or UHMWPE), a unique plastic that is stronger than steel. Dyneema, however, uses UHMWPE in a non-woven form, laminated between two sheets of polyester. With Ultra, Walcoff chose to create a woven UHMWPE and polyester fabric, laminated with a recycled RUV film. According to Walcoff’s test results, Ultra has about three times the tear strength of Dyneema, and seven times greater abrasion resistance. It bests X-Pac by even greater margins.