• Buy-one-get-one-free item?
• Canal protector
• Drum cover?
• Half a pair of warmers
• One of a warming pair
• Winter warmer
• Winter wear
• Either of a pair of ear coverings (usually connected by a headband) that are worn to keep the ears warm in cold weather
Англо-русский строительный словарь.Академик.ру.2011.