REI Cascade Rain Pants
Here's what other sites are saying:
The PVC-free REI Cascade rain pants will help keep him warm and dry while hiking or just stomping in puddles. Pants feature a PVC-free waterproof, breathable coating; they're also wind resistant up to 60 mph. Elastic waist with drawcord adjusts easily for a secure fit. Adjustable cuffs seal out the rain. Reflective accents enhance low-light visibility.