D3O uses patented, patent-pending and proprietary technologies to make rate-sensitive, soft, flexible materials with high shock absorbing properties. Dimensions are below, in general size 6 and 7 are for women's jackets, sizes 8 and 9 for unisex/men's jackets. Benefiting from airwave technology, the D3O® Viper Pro is extremely flexible, low profile and lightweight, whilst offering incredible protection. The D3O® Viper Pro is CE certified. D3O® patented technology Certified to exceed the performance requirements of EN1621-2:2014, Level 2 Airwave Technology for improved airflow Flexible ergonomic design for comfort and protection Thickness: 18mm Full back protector offering maximum coverage Size 6 - Dimensions: 365mm x 241mm, Weight: 340g, Torso length: 40-44cm Size 7 Dimensions: 405mm x 268mm, Weight 415g, Torso Length 44-48cm Size 8 Dimensions: 444mm x 275mm, Weight: 474g, Torso length: 48-52cm Size 9 Dimensions: 477mm x 316mm, Weight: 588g, Torso length: 52-56cm