These splints are ingenious in that they allow to spread the big toe and maintain without the right to build on the adjacent toe (which quite suffers in other systems). They are light, flexible and foam protects well the onion without hurt. They do not prevent sleep and are well maintained by a strong Velcro. I am very pleased with this purchase and would recommend it to people in search of a Bunionectomy valgus prevention training. This deserves to be tested !!!