the sole of the foot to provide for more comfort in one preferred embodiment of the invention first and second sides 116 and 118 have a substantially concave outer surface to accommodate adjacent toes 106 also in another preferred embodiment rearward region 122 has a substantially concave outer surface now specifically referring to fig7 and 8 an alternate preferred embodiment of device 100 is presented at least a groove 130 extends from first side 116 and travels through rearward region 122 and ends at second side 118 groove 130 is designed to supply oxygen and remove moisture from between toes 106 and web space 108 in order to provide greater aeration and moisture removal a plurality of grooves 130 to 130 c may be provided now referring to fig9 through 14 another alternate preferred embodiment of device 100 is disclosed wherein opening 132 is located along the length of rearward region 122 and allows access to aperture 124 by insertion of stem 102 there through opening 132 has a lip 134 that extends and removably attaches to a corresponding mating region 136 wherein during engagement of device 100 to stem 102 lip 132 spans opening 132 and prevents removal of device 100 while sandal 104 is worn lip 134 can be pulled away to allow.