STEIN SENTINEL PRO Technical Work Shirt The SENTINEL PRO Technical Work Shirt is manufactured using a special blend of Black & Orange full stretch Technical Cotton fabrics. These fabrics are designed to maximise wearer comfort in different climates. The SENTINEL PRO work shirt is available in both Short or Long Sleeve versions. Both versions are fitted with special magnetic fasteners on the neck opening which allows you to quickly open or close the opening single handed. On the long sleeve version, the sleeves are slighted extended which helps prevent the sleeves riding up when stretching. The forearms are slightly tapered for a closer fit and fitted with elasticated cuffs.