Leggings are very similar to tights but footless. There are many types of leggings like short and long leggings, patterned leggings and even leggings imitating trousers called jeggings (mock jeans) and treggings (mock trousers). Also leggings come in different deniers. Denier defines how thick is the material used in manufacturing hosiery products. Not all leggings are 100% opaque therefore you should pay special attention when buying leggings. Learn more about denier.