Hot Stuff Oven Mitt Around the Bobbin Create a designer silicone oven mitt with your favorite fabrics. Transparent silicone overlay, instructions and templates included. Makes one oven mitt approximately 13 in H x 7-1/2 in W. Silicone overlay is 100% food grade silicone and heat resistant up to 450 degrees. Just add 2 fat quarters of fabric and cotton batting. Refill silicone overlays available.