The Marmot Trestles 30 Synthetic Sleeping Bag is a staple for summer surf trips, shoulder-season backpacking trips, and overnight forays into the mountains. It's light and compact enough for taking out on the trail, yet still comfy enough for casual car-camping adventures. The Trestles' synthetic Spirafil insulation and wave construction provide protection from mild temps, and it retains loft even if it gets slightly wet. Whether we're traveling by foot for a week or escaping the city for a night, we sleep in comfort with the Trestles 30.