I see a lot of half truths in this thread.
Weight of your boot does affect your legs being tired. As well as other factors, such as fit and socks for example. Socks that are required with the shorts are crappy to say the least.
And yes wet socks do help initiate blisters. It isn't just fit. Don't believe me do a Google search on "do sock liners prevent blisters". Things such as lack of water, sodium, and potassium amongst other things also contribute to your legs being tired.
http://www.wta.org/hiking-info/basics/how-to/how-to-prevent-blisters
http://ergonomics.about.com/od/running/a/heavy_shoes.htm
http://walking.about.com/cs/safety/a/notrecommended.htm
http://www.theclymb.com/stories/pas...-runners-vs-approach-shoes-vs-barefoot-shoes/
I may not be an expert, but I'am fairly knowledgeable when it comes to the subject, as I have done a fair amount of extreme backcountry. By extreme, I mean 50 miles in 120 degree shadeless heat for example. And I have pictures to prove it. Weight is a huge factor especially when your carrying 7 liters of water when your able to find it. And no I don't wear any of the boots in the below link when doing these excursions. I have found them to perform well at work however.
Saw Eccos were mentioned. Great shoe/boot. I found the soles to be a little soft and not last too long at $250 a pop. Still wear them when there is some shallow snow and need a waterproof boot. Rocky sells a low ankle waterproof boot that I picked up, but haven't tried as of yet.
http://www.rockyboots.com/rocky-mens-boots/rocky-alphaforce-waterproof-duty-boot/FQ0002167.html?dwvar_FQ0002167_color=01#start=1 ;
Back on topic. Here is a link to some good boots that fit the uniform requirements.
http://www.rockyboots.com
And here is a link to some high quality socks.
http://fitssock.com
Some may already know this, some may not. If your boots are Gore-Tex, do not polish them. It will plug the pores and will ruin the Gore-Tex.
I use this as a cleaner for my boots and scrub with a brush. Yeah, the 4 reviews are low, but it is just a cleaner. Not sure what the deal is. It has always cleaned the dirt and debris off the outside of my boots.
http://www.amazon.com/Nikwax-Footwear-Cleaning-Gel-4-2-Ounce/dp/B0042NNZBC/ref=sr_1_1?ie=UTF8&qid=1412481038&sr=8-1&keywords=nikwax footwear cleaning gel#customerReviews
I then top them with this product. And it won't screw up your Gore-Tex.
http://www.amazon.com/Obenaufs-LP-Boot-Preservative-Preserves/dp/B0002X520S/ref=sr_1_2?ie=UTF8&qid=1412480844&sr=8-2&keywords=obenauf's
Some may be interested in these boots in this link as well. Haven't bought this brand for a while, as I prefer the Rocky boots.
http://www.thorogoodworkboots.com
Hope this helps someone.