This instant download pattern is non refundable. "The Mack Pack" is a bit warmer for 5-5.5" horse bits. Adjustment lines are included so that you can customize the width to for your bit. It's not just a bit warmer, it's a hand held heat or ice pack! See tester's comment below. The sewing pattern includes the reusable heat/ice packets. (For heating, you may use disposable hand warmers instead.) There are also instructions for making the heat/ice packet refillable instead of sewing them shut. It's a good option in case you want to wash the packets. The fleece cover can be machine washed and dried. The packets can be heated in a microwave for 30 seconds before inserting them in the inner pockets. The bit warmer is then folded and wrapped around the bit. Instead of holding a cold bit and blowing on it, you can place the bit in the warmer. A bit warmer is the perfect gift for both horse and rider. You may make items to sell from this pattern in quantities less than 100 per year. Mass production is not permitted. "I heated mine last night, 30 seconds on 100% on our microwave was perfect, I'm prone to middle ear infections and have been using a full size (one that can go from shoulder to shoulder behind your neck) bean bag for earache but have found that cumbersome, I'm very very sure that this one will be perfect for my earaches, its the exact size I need."