Mens Oscar Jacobson Hamilton Baselayer. High performance base layer offering excellent thermal protection and quick moisture wicking capabilites to deliver highly effective body temperature regulation. Lightweight polyester blend fabric contains generous levels of stretch to move with your swing. whilst a soft inside fabric gives next to skin comfort. Finished with Oscar Jacobson branding to left sleeve. left collar and back neck. 85% Polyester. 15% Elastane - Compression fit