Earth Therapeutics Moisturizing Foot Socks with Foot Prints Socks for sleeping beauties. Worn over Earth Therapeutics Tea Tree Oil Foot Balm, these socks soften and repair feet overnight. They work with your body temperature to seal in and ease penetration of emollients, gradually softening hard skin and calluses. Cotton (90%) and lycra (10%) blend breathes to keep feet cool and comfortable. One size fits most.