Some people use these for tactile information about the position and direction of their feet during gameplay, which is particularly useful if you have a small area to play in. You can find round ones, square ones, circular ones, or even some unusual odd shapes.
While there are mats designed specifically for VR, there are plenty of other options you can use including:
Be sure whatever you use won’t slip around as you play – if you’re placing it on top of carpet, try attaching Velcro to the underside so it will grab the carpet.
Amazon has a number of mats designed for VR with anti-fatigue padding, including these two that have been recommended by other users:
This 23” round one
This one designed for fitness games:
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