I bought one of these.
3' x 10' Green Softball Pitchers Mound With Power Strip
Only had it a couple of weeks but it's been a life saver so far. Already too cold and wet outside in the mountains.
I like how Monica is pitching indoors in full Tennessee regalia and metal spikes.
I have this same mat, but in the clay color. Never could figure out why softball pitching mats would be green.