The safety vest can only offer extensive protection if it fits snugly on the body. This means that the rider should be able to move freely and flexibly. If the vest fits too tightly, this prevents the rider from finding the optimal fit and the rein aids may be impaired as a result. In the worst case, a vest that is too tight can also cause pressure points or even pain. Some vests have variable fastening straps or further adjustment options, allowing the appropriate size to be selected. When choosing a size, it is also important to bear in mind that safety vests can expand when they heat up. After all, it is advisable to try out several vests and sizes in order to be able to decide which is most advantageous.