Why It's CoolThis three-pound freestander proved so light, I thought it was made of helium. It's single-wall construction uses waterproof-breathable Epic fabric, and it scrunches down to the size of a Nerf football. » The dome design uses two cross poles, and the roof flares out with a short awning pole, protecting a small back window that opens for ventilation. You can fly a kite under the 43-inch ceiling, while nearly vertical walls make the more than 30 square feet of floor quite livable. » Peel open an entire wall for unobstructed 180-degree views and excellent ventilation. Buttoned up, the Lighthouse was one of the most breathable single-wallers I've tested.Hmmm . . .The pole ends can puncture the flyweight floor if not centereed into the grommets. » The steep price doesn't include the vestibule, which will run you another $139.