SkechersMen's Relment-Pelmo 64869 Lace Up Waterproof Boot

Do these come with both a left and a right boot?

Is it good for walking in snow or slippery surface?

How durable are these?

Im 6'2 240 walk about 5 miles a day while carrying water upwards of 80lbs and pushing up to 400lbs up/down hills. Will they stand up to demand?