Acclaimed by emergency care providers and outdoor enthusiasts worldwide (and even beyond the Earth, on NASA space shuttles), the SAM® SPLINT is based on an ancient construction principle: curves are strong.The SAM® SPLINT is built from a thin core of aluminum alloy, sandwiched between two layers of closed-cell foam. The SAM® Splint is extremely pliable. Bent into any of three simple curves, it becomes extremely strong and supportive for any fractured or injured limb.