This is the NeoAir Air Pillow from Therm-a-Rest. It's a standard model for ultra-lightweight pillows for mountaineering and camping. Based on the size measured with a ruler (approximately 38cm x 28cm), it's likely the "Regular" size. Details from the image: • Model Name: NeoAir Air Pillow • Made in: USA (Seattle) Features of this pillow: This pillow uses the same technology as Therm-a-Rest's famous "NeoAir" mattress series. Instead of just being hollow inside, it has a triangular core matrix structure, which reduces the unstable "bouncy" feeling typical of air pillows, providing better head stability.