Kooga Power Baselayer-JuniorKooga Rugby Skins Power Shirt Red The KooGa Base Layer Cold Power Shirts are constructed of compression fabric designed to stimulate the flow of blood to critical muscle groups. The player will experience less fatigue, less lactic acid damage and therefore soreness and ultimately recover faster from our base layer products. KooGa is printed across chest and on arm also with contrast colour over lock stitching around collar and on raglan sleeve.