Shop X-Line X-Line Products Designed by in-house podiatrists, our X-Line range offers precision treatment for a range of foot and lower limb conditions. See our full range of products below. HomeShopX-Line X-Line TPD50 The TPD50 insole is a softer version of the TPD orthotic device and is very helpful for many symptoms related to a lot of foot flattening on standing and walking. £28.95 + More Stay one steap ahead in the treatment of foot and lower limb conditions. Call the HealthyStep team on 01457 839549