Great-value 3-pack of low-rise trainer socks, or shoe-liners as they are sometimes called. Calvin Klein's Coolmax trainer socks 3-pack in pink, yellow and blue bring vibrant colour to your trainers this season. Designed to hide neatly inside your trainers, these breathable socks are made with Coolmax technology that moves moisture away from your skin to keep you cool and fresh. Autumn Winter 2016. To fit UK shoe size 6.5-11.0 (Euro 40-46).