Climbing Saddles. OSHA Standards: All climbing saddles and Industrial Seats meet applicable OSHA standards for tree surgeons, construction and building maintenance work and are classified as suspension belts, ANSI Class IV. Support members are of nylon with more than required strength characteristics. Support hardware is forged. The tree saddle system that John uses is a unique treestand setup that allows him to hunt light and mobile. Today he gives a preview of how he prepares a tree for hunting. John has 31 bucks in the Michigan During muscle contraction myosin cross bridges attach to which active sites