I've been wearing these Under Armour Speed Freak boots for about a year.They are light and comfortable with good traction.They have a waterproof,"breathable" lining.They are probably the lightest boot I've owned at 2 lbs 13 oz for the pair,size 10.That's actual weight.Forget manufacturer's weights,they all underestimate.
I don't pound the miles like I used to so they haven't been abused but so far they have been good.
That Vivobarefoot looks excellent but with that narrow toe box,I know they would never work for me.If they would fix that,I bet that would be a close to ideal light hunting boot.