I've had problems with left side toe curling and foot cramping when I exercise, intermittent but very annoying when it happens because I have to stop to stretch my foot out which interferes with getting a good workout. An acquaintance with PD told me that he is helped by walking barefoot or in flip flops, but I can't do that in Oakland in 50 degree weather or on the muddy trails this time of year. So I got myself a pair of purple shoes with separated toes. The soles are sturdy enough to walk on trails and cement, but thin and flexible enough to feel the ground through them and allow my feet to move naturally. After two days using them, I can say that so far they're a great help. I walked around Lake Merritt, 50 minutes, with NO toe curling, and today hiked for an hour and a half with no issues. The sensation of walking in these shoes is pleasurable for me, kind of like getting a foot massage. UUUUUGGGGGGLLLLLYYYYY but GOOD!