When you're climbing, you need to make sure you've got a good hold. Petzl America Power Crunch Chunky Chalk is made up of chunks and chalky powder to help you get a grip, firmly outdoors or on a gym rock wall. It comes in two sizes for use on your next climb. The 100g bag fits easily into most chalk bags, while the 200g offers extra chalk to help you reach higher heights. Both bags are resealable to keep your chalk safe and secure when you're up in the air.