SPIDER is a CMB polarimeter that completed its first long duration ballooning flight from Antarctica in January 2015. From its vantage point at 36 km above the ground, it observed 12% of the sky over 16 days at 94 and 150 GHz. I will discuss the design of SPIDER, including our reasons for choosing the ballooning platform. I will also describe some of the subsystems and how they performed during flight. Then I will show preliminary results from the ongoing data analysis. Finally, I will give an update on SPIDER 2, which will add focal planes at 280 GHz to improve our sensitivity to Galactic dust, and is expected to fly in December of 2018.