Foot health experts are raising concerns about the potential risks associated with the popular On sneakers, known for their distinctive hole-filled soles and advertised as providing a "cloud-like" walking experience. While the shoes, which cost between $140 and $200, have gained widespread popularity among celebrities and the general public, some specialists suggest their design may not be ideal for all activities.
Dr. Bob Baravarian, a Los Angeles-based foot and ankle surgeon, described the shoes as "more of a gimmick than actually a good shoe," particularly for strenuous exercise. He noted that the flexibility of some On models, especially older versions, might not offer sufficient support for individuals, particularly those with lower arches. "A shoe is like a brace – it should support your foot and keep it stable," Baravarian stated, adding that a lack of adequate support can force the foot's muscles and tendons to work harder, potentially leading to pain and conditions like plantar fasciitis or tendonitis.
Plantar fasciitis, a common cause of heel pain, affects the band of tissue supporting the foot's arch. Tendonitis, including Achilles tendonitis, involves inflammation of tendons due to strain. Contrary to the expectation that ultra-cushioned shoes would mitigate these issues, some research indicates that "maximalist" sneakers, including some On models, might not offer additional protection and could even increase impact forces on the feet and legs.
One study suggested that runners wearing highly cushioned shoes experienced greater impact forces, possibly because they instinctively stiffened their legs upon landing, negating some of the cushioning benefits. Dr. Bruce Pinker, a podiatric surgeon in New York City, also expressed concerns about the progressive compression of On's sole during walking. He warned that the hollow pods could compress unevenly, potentially causing the foot to roll inward and increasing the risk of instability and biomechanical injuries like ankle sprains, especially with older, worn-out shoes.
Beyond support and impact, the design of On's soles presents other challenges. Debris such as stones and twigs can become lodged in the sole's gaps, which experts suggest could interfere with the shoe's intended compression. This has been a common complaint among On owners, with online forums and social media posts detailing frequent cleanings of the soles.
Furthermore, a number of On owners have reported an irritating squeaking noise developing in their sneakers. This issue led to a proposed class-action lawsuit filed by two customers alleging that their CloudTec shoes produced a loud and embarrassing squeak. The lawsuit was dismissed, with the judge noting pre-existing online evidence of the shoes potentially squeaking before the purchase.
Experts acknowledge that newer On models may feature stiffer, more supportive soles. They also emphasize that for many everyday tasks, such as short walks or office wear, On shoes are generally acceptable and that they rarely encounter patients with foot problems specifically attributed to the brand. However, for running and more intense athletic activities, they suggest that other footwear options might be more suitable.