These overshoes are meant to be worn over one's regular work boots in order to protect them from the elements and rugged work environments. They're made of Ozone & Tear Resistant Rubber with Rust Resistant buckles, and are Waterproof and oil-resistant.

Red Wing Shoes contracted LaCrosse Footwear in the early 2000s to make various Red Wing brand overshoes for them, including these. This style is most similar to Lacrosse's 2 Buckle ZXT Overshoes that are still being made and sold today, and are sized similarly.

For picking a boot size, I'd recommend going with an overshoe that's 2 sizes larger than the boots you intend to wear with them, unless you're already familiar with Lacrosse overshoes and know what size you need.