Bitcoin miners can spread the word with Bitcoin “Mine Hard” Gildan Unisex Logo T-shirts. The softest 100% cotton shirt ever. Water based earth friendly inks that you can barely feel. Shirts are made to order. Free Shipping is the only option and takes an estimated 2-3 weeks for creation and final shipment arrival. An email confirmation will be sent when shipping has been procesed. Shipping in the USA only. Sizes include S, M, L, XL.