It was hard to choose which version to get but in the end, the whale tail was the choice for me. My hubby directed a few VR projects focusing on whales and sealife so this was awesome! The active knot is a great idea for adjustability and I did add a small rubber band at the end of the loop to further secure the tie against the tail. Works great! I didn't realize that you couldn't get the bracelet wet (I assumed from all the beach photos that it was ok to get wet) so unfortunately the rope has lost a bit of it's vibrance due to a few washings. Otherwise, a wonderful bracelet for a great cause. Thank you.