These trousers are not designed to be placed over another pair of trousers. They are designed to be put on first from the start. They can be worn all day and still keep you warm and dry. They are not as bulky as your usual waterproof outer layer and are designed to be your first and last layer all in one! They are made in a durable nylon stretch outer which has a DWR finish and lined with a soft Hydro/dry stretch liner, making the trousers an extremely warm and comfortable piece of outdoor kit. Semi-elastic waist band - for a comfortable and tighter fit for the wearer. Zip fly Zipped Pockets - to securely store valuables in such as keys or change. Hydro/Dry Fabric - exclusive to Sprayway this fabric has an excellent waterproof rating as well as excellent breathability. What is Hydro/dry technology? A Sprayway exclusive fabric. Manufactured to exact specification to give maximum performance and comfort with a waterproof rating of at least 5,000mm hydrostatic head.