There are different helmets for different activities:
A bike helmet is the best helmet to wear while bicycling because it’s designed to protect the front of the head. In bike falls, it’s common for the rider to fall forward.
A multi-purpose helmet can be worn when skateboarding, roller-skating or riding scooters. When on skates or scooters, falling backwards or to the side is more likely, and a multi-sport helmet is designed to better protect the back of the head.