From Earth Mama Angel Baby...

To help relax muscles and reach a localized aching or cramping spot during labor, quickly heat Hot Spot Labor Sock in the microwave. The handy ribbons allow you to position this heatable little beauty in exactly the right spot to apply warm, moist heat for deep penetrating comfort, and yet still allow you mobility.
Filled with rice and calming lavender blossoms, it gets right to the achy spot without overheating you - natural support for natural childbirth.