Direct Rx Lens Available means the goggle lens itself can be custom-made with your prescription correction by the manufacturer or a partner lab—no separate insert needed behind the main lens. This is the cleanest prescription solution because you're looking through one lens with your correction built right in, rather than a goggle lens plus an insert behind it.
The big advantage is optical quality. Without an inner insert, you get better peripheral vision and no risk of the insert shifting or fogging between layers. It's also the most comfortable option since nothing extra sits inside the goggle frame.
The trade-off is cost and availability. Direct Rx lenses typically come at a premium price, and only certain goggle models offer this option. You'll also need to order through specific channels—often directly from the manufacturer or an authorized lab. If you want the simplest, highest-quality prescription goggle experience and don't mind the price, direct Rx is tough to beat.