Holster for IWI Masada Slim Our IWI Masada Slim holster was designed and crafted using our high-tech proprietary process to exacting specifications. We’re so confident in our IWI Masada Slim holsters that we back them up with a lifetime warranty and 30-day free returns. The Base IWI Masada Slim IWB holster is designed for EDC and all-day comfort. It can be worn cross - draw, appendix, strong side, or all the way to small of back. The IWI Masada Slim holster fully protects the trigger and mag release for ultimate safety.