I perform maintenance for USPS and I love these shirts for work. Having worn both these and the thicker Dickies Work Shirts that are made primarily from cotton (LS307) I will choose these first. The material is lighter but seems to be more durable. Where my LS307 work shirts have developed small pinholes from the chemicals I work around occasionally, the LS535's are still going strong. Also these seem to be less likely to stain due to the larger balance of synthetic materials.
My only complaint is one that is stated often with any of these style shirts from Dickies and that is they run small on sizes. I usually wear a large and it is too tight in the shoulders restricting movement. So I have to buy an XL for proper fit. My only reason for 4 instead of 5 stars.