The Circuit Z is Black Diamonds tri-fold, daily workhorse for the cost-conscious boulderer. It features our closed-cell PE foam layup with EVA bonded together, making it lightweight, but solid, for impact protection. The suspension system is comfortable, with shoulder straps, and a waistbelt. The Circuit’s square corners make for better coverage when paired with other pads and integrated multi-pad carry system makes it easy to carry multiple pads at once.