procap helmet

A protective rubber pad attached to the outside of professional (American) football helmets, used to decrease head injuries
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

procap helmet

Sports medicine A protective rubber pad attached to the outside of professional football helmets, used to ↓ head injuries
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.