By Sky News SkyNews - Friday, April 4 07:24 am A new bullet-proof hoodie to protect against street violence is due to go on sale later this month. The £300 "Defender" hoodie makes the wearer's upper body invincible to 9mm Magnum handgun bullets, according to its maker. It was developed by London-based company Bladerunner, which also manufactures stab-proof tops. Company owner Barry Samms said a mother from Walthamstow, east London, whose son had been mugged three times, was among customers asking for bullet-proof clothing. "We've had quite a lot of interest from the US and a couple of calls from the UK," he said. "Our current customers range from undercover police to security workers to concerned parents." The top is made from a new fibre called Dyneema, which is thinner than the material used to make traditional bullet-proof vests. Mr Samms denied his firm was targeting teenage gang members with the invention, claiming the hoodie was the best way of disguising its bullet-proof nature. "It's only a hoodie because you can't really put a zip across the front of something bullet-proof," he said. "Adults wear hoodies too. My mum wears one and you don't see her hanging out on street corners. "We really thought last year when we brought out the stab-proof top that they were going to be for teenagers, yet they are the last people to actually buy one." Mr Samms said the hoodie was primarily aimed at US customers concerned by the amount of gun violence in their country. "I don't see that there is much of a market in the UK, because luckily we have such strict gun laws," he said. "People don't have to go to such extremes to protect themselves over here." The hoodie is currently in the prototype stage, but orders can already be placed with Bladerunner, which has offices in Romford, Essex.