Regatta Boys Stormbreak Waterproof Overtrousers (3-14 Yrs) - 14Y - Black - Available at M&S
These waterproof Regatta overtrousers are perfect for splashing around in on outdoor expeditions. They're made in a regular fit and cut to a practical longer length. The elasticated waist makes for easy on and off, while taped seams ensure they stay completely dry in wet weather. Thanks to the two side openings, they can still access any items in their pockets.