Going the ultra distance just got a little more comfortable thanks to these Arnuva 50 Boa Running Shoes from The North Face. Most running shoes opt for laces and various versions of cordlocks but The North Face Arnuva 50 Boa Running shoe uses a thoughtfully engineered Boa system that allows for minute adjustments for optimal closure over your foot just the way you like it and every time that you run. The Boa offers a special suspension system that allows you to dial in the fit so you never have to deal with pressure points or re-lacing your shoes to get the same fit you had the last time you ran. This fit feature might not matter to runners who stick to the 5K fun runs but if you're into ultramarathons the consistent comfort and micro-adjustment options mean that you have one less thing to worry about. The Arnuva has a mesh and Nubuck leather upper that makes the shoe far lighter and more breathable than other shoes like The North Face Endurus XCR Boa Running Shoe but this extra venting can make the Arnuva 50 less desirable in damp weather conditions. You'll also find a lighter TPU injection saddle and rear foot compression cage that saves weight but doesn't offer the same degree of over-pronation protection found in shoes with the TNF Roll Control™ medial heel wedge (mild pronation issues shouldn't be a problem). The X-2 polymer damping compound throughout the heel and forefoot do a nice job of absorbing footstrike impact especially if you're covering miles of asphalt and unyielding concrete. If you're looking for a good shoe for summer marathons or a real triathlon the Arnuva 50 Boa Running Shoe is a great choice especially if you're covering plenty of distance in high heat and humidity.