Fred Perry Loop Back Steel Marl Grey Sweat Trousers. Elevate your casual style with the Fred Perry Loop Back grey Sweat Trousers. Made with a comfortable loop back fabric, these trousers feature a classic grey colour that pairs well with any outfit. Enjoy a cosy and stylish look while showing off your love for Fred Perry.. 1 Back Pocket, Cuffed Bottoms, Grey Joggers. Drawstring Waistband, Loopback Joggers, Slim Fit. Stripe Design On Back Left Pocket, Brand Logo On Front Left Pocket, 79% Cotton, 21% Polyester. Style Code: T2515 420 Colour: grey