This shoulder vest is worn by top International, Super 14, club and provincial players. Revolutionary BaseLayer Ionx delivers ionic energy to the body through a negatively charged electromagnetic field. Ionx improves performance and accelerates recovery by increasing the flow of oxygen-enriched blood to the muscles. Super stretch breathable and wicking Nylon, Polyester, Lycra fabric provides a snug fit and reduces muscle oscillation. Wear when it's cold to keep you warm. Flexible 10mm honeycomb sandwich on the shoulders allows for freedom of movement, improved breathability and maximum protection. Closed cell foam padding on the biceps, sternum and kidneys provides extra protection, which can be removed if necessary. Full length t-shirt design with a crew neck. IRB approved.