By Cam Vigliotta There’s a right and a wrong time to stock up on winter essentials. The wrong time would be weeks before winter when most of us are investing in shells, parkas and other cold-weather goods at the last minute. But the right time is, well, right now as temperatures climb across the country and our favorite outdoor brands discount their cold-weather inventory. If you’re willing to hold onto a few winter staples until next year, LifeLabs’ rare end-of-season sale is a great place to shop. The brand’s scientific approach to outerwear is revolutionizing how we think about textiles, an…