If using the black diamond for teaching purposes keep in mind that the back inflate will make it a little more difficult on the surface since it pushes your face-forward. This is not insurmountable, but can make it harder to have a conversation on the surface, etc. Just wanted to point that out. This is a well-made product with nice features such as back padding, etc. It is a premium item and tends to be a little pricey but should last a while.
