Here is a golf putting mat that lets you practice indoors or outside like a pro. The FORB XL Putting Mat can be rolled out anywhere. It is designed to replicate real-life golf greens. The mat measures 13.1ft x 6.5ft and has two grass gradients.
The FORB Professional Putting Mat comes with 4 holes, golf balls, and everything you need to get started. The bad news? Something like this doesn’t come cheap.