I have owned many pairs of Saucony and until lately, they have provided good fit, wear, and performance for my sz 13s loaded with 250 pounds, marching through the soft sand on the gulf beaches here in Pinellas County FL for 3 - 5 miles at a stretch.

I noticed this problem first with the Cohesion NX after about 6 months. That pair was replaced by my now retired Cohesion 3s. Purchased in 12/2010, and they are already unwearable. In my opinion, the fabric liner in the heel of the shoe is made of something not very durable(think crepe paper). After just three months it was shredded, and was doing same to my skin through a double pair of socks.

Yeah, sand has to get into the shoe, and that creates the issue I believe. Due to the mesh frame, more sand than needed migrates into the shoe, and voila, instant unwearable shoe.

No more Cohesions for me, at least not on the beach.

Credit to Saucony though, they indicated that they will replace them if I ship to them.