The term 'boot covering' can be summarized as a garment worn over the foot and lower leg for protection and warmth. The most common type of boot covering is a GAITER, which is a 6-letter word. Gaiters are typically made of waterproof or water-resistant material and are designed to protect the wearer from mud, snow, and other elements. They are often used in outdoor activities such as hiking, skiing, and mountaineering.