Bump Hat Size-Guide

At Vaikobi, comfort and safety go hand in hand. Our gear is designed to move with you, protect you, and perform at the highest level on the water. To ensure you get the most from your equipment, check our detailed size guides for accurate measurements and fit recommendations.

All measurements are guides only. From time to time some people might find that their perfect size does not line up with the size chart data.

Size Head Circumference
S/M 52-57cm
L/XL 56-62cm

Head Circumference:


Place a non-stretchable measuring tape at the widest possible circumference of the head. This involves wrapping the tape around the largest part of the forehead and the biggest bump at the back of the head.