Metatarsals and ankle bones are illuminated in the new Bone Glow In The Dark black crew socks from Apthcry. Retaining UV light whenever available (leave in direct sunlight for best results), these black socks become glowing in the dark presenting jacquard knit graphics of foot/ankle bones and the word "Trick" across the left toes and "Treat" across the right toes to create the spookiest of all socks.