Free thermal socks with your purchase! Never let your toes go cold again with these rechargeable remote-controllable insoles . Choose between three separate heat settings so you can choose what's right for you . Designed with your ultimate comfort in mind, these insoles are ergonomically shaped and contoured to give you that tailor-made feel. Thin enough to work with virtually any shoe, boot or even slipper, they are still thick enough to provide perfect levels of cushioning to help keep your feet warm even when not switched on. It is of course possible to trim these insoles to size to obtain the perfect fit. We've also included a handy carry bag! Features Easy-to-use remote control keychain in order to switch on/off, or flick between three heat settings Wireless battery system - self-contained system means no fuss or external battery boxes Charge wherever you need it - can be charged in any micro-USB car charger or battery powered micro-USB charger pack, existing USB wall plug, PC or laptop port Advanced far-infrared heating element distributes heat gently and evenly Adjustable to your shoe size - trim the soles for the perfect fit following size guide Waterproof design - perfect for hiking, fishing and other outdoor hobbies Specifications Small - US: 4 -6, EU: 36-38 Medium - US: 6.5-8, EU: 39-41 Large - US: 8.5-10.5, EU: 42-44 XLarge - US: 11-12.5, EU: 45-47 Click here to view the instructions Heat Settings: High - lasts up to 3 hours up to 50Â°C Medium - lasts up to 3.5 hours up to 45Â°C Low - lasts up to 4.5 hours up to 40Â°C LiPo battery Unisex design is ideal for both men and women Power your new USB scarf with our Warmastone: Warmastone Far-Infrared Heating Element The far-infrared heating element in these insoles is placed beneath the toes, as this is the part of the foot most susceptible to the cold. The infrared technology provides gentle, soothing heat for up to 4.5 hours on the lowest heat setting. It can also aid in the relief of Raynaud's Disease Raynaud's Disease or Raynaud's Phenomenon Dr Rob Hicks First described by Maurice Raynaud in 1862, Raynaud's is thought to affect as many as 10 million people in the UK. Extreme cases suffering severe pain in the extremities when exposed to temperature change. and mild arthritis by helping to increase blood flow and keep extremities warm . Remote Control Simple keyfob remote control operation means you can switch the insoles on and off or change heat setting without even taking your hands out of your pockets. Syncing the remote with the insoles is a breeze. Simply switch on one of the insoles and hold down the lock button until the blue LED flashes, then repeat for the other insole. Now, the insoles and remote are synced! It really is that simple ! The remote control keychain can be used to switch the heat on or off, or to change heat settings. Rechargeable Battery The battery used in these insoles is rechargeable , and can be used for up to 4.5 hours, depending on the temperature setting. This time can be further increased by only switching the insoles on for short bursts as needed. The cable plugs into a convenient micro-USB port in the side of the heel, so there is no need to remove the battery in order to charge. The insoles also come with a USB cable which can be used for both insoles at the same time, using any existing USB wall plug, PC or Laptop. You can even charge these insoles on the move with any other micro-USB car charger or battery powered micro-USB charger pack. Trim to Size These insoles can be trimmed to achieve a perfect fit and are completely waterproof . This makes them versatile, and means that they can fit into many different types of footwear. They are perfect for anyone who works outdoors. Handy Carry Bag The handy carry bag included with these insoles ensures they are kept protected when not in use. With a handy drawstring at the top, this insole can be hung up when not in use, or to store out of the way.