Titin Short Sleeve Cover Shirt Build strength with the supportive Titin Compression Cover T-Shirt. Designed to go over the Titin Force Weighted Compression T-Shirt System, this cover shirt locks the weighted t-shirt down so you can focus on your workout and build strength. Double stitching ensures long-lasting durability so you can achieve your long-term training goals. 87% Sorbek/13% LycraŽ. Imported.