Foam cervical collars The foam cervical collars specification as following, Shaped for comfort and to give the correct support to help relieve the pain suffered from whiplash, stiff neck and muscular tension. Made from high density closed cell foam (100D) for better support, have a woven covering. Available in 3 sizes; small, medium and large. Small: Length 44cm; Width: 9cm; Medium: Length 48cm; Width: 10cm; Large: Length 53cm; Width: 11cm