I've got few headphones for gym and 2 pairs of these. For this price sound is quite good. I bought them for the original price £24.99, but it was a while back.
The black Sony ZX310 Headphones deliver powerful, bassy audio packaged up in a compact fully folding design. With metallic earcups, coloured grooved cables and comfortable padded ear pieces you can get lost in your music for hours on end. Even better, the ZX310's provide great sound isolating earcups so you can cut out external noise.