Redefines Parachute Construction. The 20" (6m) UltraGrip Parachute is the most durable and comfortable we"ve ever manufactured, made so by two breakthroughs in parachute construction. The most obvious is the handgrips with deeply cushioned 1"D x 12"W (25mmx30cm) UltraFoam grips large enough for a two-hand grab. What"s not obvious is that 100% of the forces exerted by the students holding the grips are absorbed by the free-floating perimeter rope. The only force absorbed in the ripstop-nylon canopy is from the air beneath it.