It’s a special order item, you just need to contact Stealth customer service for them to help you out, that’s how I got mine. AFAIK the product is still in development, so that is why you don’t see it on the products page. I did the same, got used to the innerwear before branching out to the other products such as Sabre Skin and MagVolt. I love both of them, highly recommend!
