These waterproof over trousers are British MOD Police surplus. They are made of 100% nylon fabric. 

Features include:

• Used grade 1 condition.
• Elasticated Waist Band. 
• Waterproof, durable and lightweight Nylon material
• Black.
• Hip side-access openings allow pass-through access to pockets of trousers worn underneath.

Waterproof Over Trousers for sale from Forces Uniform and Kit, the genuine army surplus clothing company.