Hi, i have a shopify website which is swimwear and im finding customers asking what products are available in certain swimsuits all the time. Basically being lazy shoppers as our products are always selling out. I am wanting to integrate a size filtering system (see below) I have tried apps but think there quite clunky e.g saying there is a size available but it is already sold out.
Would love to know if anyone knows what this website is using for there filtering system?