My sons and I build all weathered outdoor baseball pitching mounds with a slip resistant surface; ALL material used is rated for outdoor and can be made portable. We do not use artificial turf as to keep costs down due to the true baseball turfs being very expensive (cheap artificial turf/carpet will not last and breaks down very easily in outdoor conditions). The top surface is a roll on gritted material that will last and can be resurfaced as needed. ALL framing material is solid wood treated for outdoor use. I know the challenges of finding inexpensive and durable pitching mounds (nonexistent). This final design is the outcome of over 10 years of building mounds for my baseball teams and private pitching lessons. Our focus mounds are designed and built for backyard or bullpen training. We do make other mounds for all levels, portable mounds, and custom sizes upon request. Being a coach myself for over 20 years and having sons that have pitched at high levels, I know the challenges of finding baseball fields with a raised mound to practice on, let alone finding the time to take them there. These are perfect for the back yard or for the coaches like me who don't have a facility at their discretion. We also build indoor versions of each mounds as well, which will NOT be rated for outdoor use. Texas based company.