These straps are available from Karen at The Yoga Factory (Porcupine Creek Farm).
 
Made from pure cotton (available in organic cotton) and features metal D-rings for superior strength and durability. With reinforced stitching that has withstood stress testing in studios across Canada, this yoga strap offers robust support ideal for any student's practice. A yoga strap can be a helpful aid when dealing with challenging stretches and certain restorative poses. Dimensions: 1.5" wide x 8 Feet. 100% Natural Cotton.