A good pair of shoes is the one that allows the feet to move as naturally as possible, especially around the toes that flex the most. Lack or low level of flexibility (i.e. high rigidity) results in high resistance force as you walk, putting enormous strain on the ball muscles as well as Achilles tendon, causing a common symptom of metatarsalgia (i.e. pain and inflammation in the ball of the feet) and inflamed Achilles tendon. However, Klas & Sylph is nothing like that. Our footwear comes with exceptional flexibility, hence keeping the chance of developing such foot symptoms to the minimum.