Spider Back with Large Laterals This Spider Back with Large Laterals is the perfect addition to your 18" w/c. It features stretch-air fabric for maximum comfort and support. With a 250 wt. cap. and 2.5" thickness, it provides ample support and stability. The 20" height provides excellent lumbar support. The adjustable laterals allow you to customize the width by 8" and the height by 3". They are also angle adjustable for a personalized fit. The innovative double mounting hardware allows for 2" of depth adjustment and 15 degrees of angle adjustment, so you can find the perfect position for your comfort. Features: Stretch-air fabric 250 wt. cap. 2.5" thick 20" height Adjustable laterals (8" width, 3" ht, angle adjustable) Double mounting hardware (2" depth adjustment, 15 degrees angle adjustment)