as another reviewer report , I have a older pair of these sandal that work well for year , until the strap break off . on the newer version , the nub start break off immediately , quickly lead to large nubless patch under the forefoot and toe . they do provide great relief of muscle stress and soreness while they last . at first , the nub become painful after about 20 minute of wear - but they become more comfortable as the foot get use to they .