Speedo Boys Aquashort (4-16 Yrs) - 15-16 - Navy - Available at M&S
These neat and practical swim trunks from Speedo are an ideal pick for swimming lessons. They're made in a comfortable regular fit, with a close-fitting leg shape that finishes at the top of the thigh. An internal drawcord at the waist keeps them in place. The quick-drying fabric is chlorine-resistant for extra durability.