As the weather’s warming up, my go-to hairstyle these past few weeks has been the top knot (just like every other girl in New York City). It’s easy, and can transform dirty strands into a cute style. I’ve played around with nearly every “bun-stuffing” contraption that has come into our office and my favorite is the Sarah Potempa The Wrap Up ($12, sarahpotempa.com). You simply pull your hair into a ponytail and slide the pony through the opening in the middle. Then, roll it up to the base, fold the flexible ends into a round bun and voilá—an instantly chic updo. If you have layers and a few pieces poke out, just smooth them down with hairspray and pin into place. You can go for a formal look (I used it to style my hair smooth and polished for a recent wedding I attended), or try something a little more piecey and casual (my messy bun held up through a training session with The Biggest Loser trainer, Dolvett Quince!). The possibilities are endless. And it comes in a smaller size, The Half Up ($9, sarahpotempa.com) so girls with fine or shorter hair can get in on the fun too.