A protective fabric cover at the top of the zipper to prevent chin chafing.

BMS (Berliner Meeresschutz-Outdoor) is a German brand known for "SoftSkin" outdoor and sailing gear. In this context, "BMS zip" refers to their specialized garment construction:

Typically includes electric start with a kick-start backup and a fully automatic CVT transmission. 🧥 2. BMS Outdoor Apparel (Zip Features)

They frequently use high-quality YKK zippers designed to withstand saltwater and harsh weather. 💾 3. BMS.zip (Legacy Software File)