What are the Sorbothane Sorbo Air Insoles? The Sorbothane Sorbo Air Insoles are the latest in a new range of tailored insoles designed to improve foot biomechanics & increase comfort & are an EU exclusive to Physio Room.com. This replacement insert incorporates advanced air-infused Sorbothane foam with additional heel-strike protection providing long-lasting protection with every step you take: Moulded arch & deep-heel cup for support Heel inlay for maximum heel-strike protection Antimicrobial cool, dry top cover helping to wick-moisture & reduce odour Suitable for work, sport or leisure based activities Please Note: Insoles & heel cups are exempt from the 30 day returns policy if they have been worn. Absorbing over 94% of impact shock Sorbothane are market leaders when it comes to insole design, creating products which perform at the highest level day-after-day month-after-month. When regular inserts have failed & lost their effectiveness Sorbothane continue to respond, react & deliver when it matters. Lauded for their lightweight design, Sorbothane insoles provide a much cooler & comfortable fit which is why they are the product of choice for Doctors, Sports-Medicine Specialists & Professional Trainers alike. Sorbothane are proven to help prevent pain & ease the associated symptoms for a variety-of-impact related injuries: Foot & Back Pain Achilles Tendonitis Runners Knee Shin Splints What size do I need? UK 4.5-5.5 EU 37.5-38.5 UK 6-7 EU 39.5-40.5 UK 7.5-8.5 EU 41-42.5 UK 9-10 EU 43-44.5 UK 10.5-11.5 EU 45-46.5 UK 12-13 EU 47-48.5 Thickness of the ball & heel. Ball: 0.5cm Heel: 2cm