Just a thought, it may not apply, when I was a kid we mostly played on dirt fields not grass, and I coached one year: makings for an inflatable leg splint. Three times growing up we had broken legs or ankles, and a couple close calls, it would have been great to splint them up before taking them to the hospital. If yours is the kind of league that calls 911 for such injuries (and has great response times) it may not be necessary. Ask the coach how often this has come up in recent memory in the league. An inflatable pad plus 4-5 cravats would do the trick.