Pre-Black Friday deals are really the north face shoes clearance heating up now, and John Lewis is getting in on the holiday sale action with its bumper Black Friday Event, which starts today and features discounts on The North Face clothing, accessories and footwear. Of course, there are many other brands on sale too, across areas such as home, beauty, toys, tech and more. But we’re eyeing up The North Face waterproof jackets, coats, hiking boots and backpacks on sale during the event. Not to mention all of the smaller accessories such as snug beanies and warm fleece gloves to beat that winter chill rolling in. Most of us remember when GORE-TEX first the north face shoes mens appeared and revolutionized outdoor clothing and gear with waterproof products that could also “breathe” so we wouldn’t get clammy on the inside as our outerwear repelled the elements. Since then, synthetic chemical-based weatherproofing has become ubiquitous throughout the outdoor industry, not only in jackets, but also in boots and shoes, backpacks, tents, swimsuits and just about everything else that gets exposed to the wet and wild. And while we’ve all been happily the north face shoes womens making our way through the rain and snow, we might not have realized that there is a dark underbelly to all of this weatherproof outdoor gear: perfluorinated compounds (PFCs). These synthetic chemicals are related to the “ hydrophobic” PFOA formulations that make non-stick cookware easy to clean by encouraging liquids to bead up and roll away. And like their chemical cousins on cookware, the PFCs in your jacket could be making you sick and polluting the environment. “PFCs are environmentally hazardous north face hiking shoes mens substances, which are persistent in the environment,” reports Greenpeace, which launched its Detox Outdoor campaign in 2012 to convince outdoor gear makers to stop using toxic chemicals in their products. “Studies show that some PFCs can accumulate in living organisms such as the livers of polar bears in the Arctic and are also detected in human blood.” Meanwhile, animal studies indicate that certain PFCs can harm reproductive processes, negatively impact hormonal balances and promote the growth of tumors.