Extra reinforced Surface: The newest arrived woodslant board is updated to use a new high-strength glue toprevent the surface from falling off, you can just take a easy for its stablity. Anti-slip step top is also gentle onbare feet, helps keep you in place safety and securely. Fullassembled and Extra side handle is for portability. Heavy-duty & Strong Stable Base. This wood slantboard is made of lauan hardwood plywood which ispremium material for long lasting stretch, durability andcapacity of 450 LBS. It's heavy duty reinforced wood, notparticle board. It's stronger and last longer than othersmade of birch and pine plywood. Optimal Stretch & Exercises: The calf plays a great rolein our daily activities and movement such as running,walking, jumping and standing. Hence, you need a calfincline board to help you stretch them and make themflexible. It also can prevent injury by stretching your tightcalves, hamstring, hips, foot and ankles, before and afterworkout