WHO, WHAT, WEARABLE JUNE by Netatmo Sun worshippers now have a way to determine when they’re catching too many rays. JUNE by Netatmo measures your sun exposure by gauging the UV index ­wherever you are. With its proprietary smartphone app, JUNE lets you know when to reapply sunscreen or head indoors. What we liked: The pretty, cut-diamond-like design pairs perfectly with beach and casual wear. Its battery, when fully charged (which takes 12 hours), lasts a full month. What we didn’t like: The device itself slides onto a double-wrap leather ­bracelet via a flat metal clip—and the clip’s grip isn’t so secure. Within 10 minutes of my first wear, I was combing through the grass trying to find the darn thing (I did, thankfully). Best features: Its usefulness for, say, office workers seems limited, but JUNE could be a skin (or life) saver for those who work and/or ex