Hallufix Bunion Aid Aircast orthosis, a product designed to alleviate mild to medium malposition of the big toe due to bunion on the big toe (hallux valgus) of the right or left foot. To gradually correct the joint deviation, the Hallufix orthosis can be worn at night to stretch the atrophied soft tissue in the big toe joint. The foot orthosis can also be used after hallux valgus surgery. The DJO Hallufix orthosis is available in 3 sizes and can be used on the right or left foot (bilateral model). Size S.