The birth of the needle felting mat, or base, was never meant to be anything special, but purely a utilitarian "whatever-you-have-on-hand" to protect your worksurface and your felting needle from breaking. There are many options available, from completely free to fancy.
Needle Felting For Beginners - What needle felting mats should I use?
Star Magnolias
Wet Felt a Waldorf Wool Playmat
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How to Pick a Felting Mat for Needle Felting — Star Magnolias
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What Felting Needles Do I Need? Easy Guide
What Needle Felting Mat Do I Need, And How Do I Use It? - Ultimate Guide To Needle Felting In The Felt Hub
How to Pick a Felting Mat for Needle Felting — Star Magnolias
What Felting Needles Do I Need? Easy Guide
How to Pick a Felting Mat for Needle Felting — Star Magnolias
How to Pick a Felting Mat for Needle Felting — Star Magnolias
Tutorials — Star Magnolias
Tutorials — Star Magnolias
I Review 7 Different Types Of Mats, Makerss Earth Mat, WoolBuddy, Foam, Hessian