Liggit Oxballs merchandise.
It's super comfortable (soft but firm) and the fit is perfect. Nice snug feeling without the death grip squeeze these silicone types can sometimes do. At first, looking at the photos, I thought it might be a bit bulky, but It's about the size of a standard medium/large cage. The vent holes aren't bothersome or really noticeable, and seem to work as intended.
Whether you're just doing light play or long term wear, I can see this being an instant favorite.
To top things off, I ordered it and got it delivered the next day. No complaints with that.