Park Tool SA-3 Deluxe Shop Apron with Header The SA-3 is made from heavy 10 oz. cotton canvas and has two rows of bar tack reinforced pockets for stashing pens, parts, tools, etc. The special crossback design removes pressure from the neck for all day comfort. A nylon quick release makes the apron easy to adjust and take off. A full 35" in length, the bottom 7" of the apron can be snapped up for a custom height fit. The SA-3 has three lower pockets. Each lower pocket is 18.5cm wide and 19cm deep (7.25" x 7.5"). There are 4 upper pockets, each 11cm deep. From right to left, the width is: 3cm, 3cm, 6.5cm, 7cm.