This product is mainly used to provide support to knees with chronic instabilisation of the cruicate ligaments and patella subluxation. It is made of laminated neoprene exteriorly with jersey and interiorly with plush The neoprene has perforation which reduces excessive perspiration without losing body temprature. The steel springs on the sides provide convenient support to the collateral ligaments whereas the straps in the front reduce tension on the crucial ligaments. Knee Support - Cruciate ACL Knee Support - Cruciate ACL Size The Armo Line Knee Support - Cruciate ACL is available in five different sizes, enabling you to choose the size that fits you perfectly. Please measure around your patella as it is shown at the image below and select the appropriate size from the table: Knee Brace Measurements Size in Cm in Inches Small 34 - 36 cm ~13¼? - 14? Medium 36 - 38 cm ~14? - 15? Large 38 - 41 cm ~15? - 16? X-Large 41 - 44 cm ~16? - 17¼? XX-Large 44 - 47 cm ~17¼? - 18½? The prices on the website is inclusive of delivery. Your product will be sent within several hours if you order before 1.00pm during weekdays. Orders after 1.00 pm will be dispatched the next working day. The orders placed during the weekend will be sent on Monday. You will receive your order within 1 - 3 days after the dispatch. All products purchased on the Website may be returned or changed with an other size of the same product for once, if you inform us of your intention to change or return the product(s) within 7 days after the purchase. The notification should contain whether you want to change or return the product and (if you want to change the product), the new size and colour details.