Microfleece

Microfleece is knit from very fine polyester filament yarns into a short, tight pile that runs noticeably thinner than polar fleece, typically 4-6 oz against polar fleece's 6-12 oz range. That short nap keeps the fabric from bunching under a jacket shell, which is exactly why it's the default layer for quarter-zips, vests, and pullovers meant to be worn under something else.

Port Authority and Core 365 both build popular corporate quarter-zip lines on microfleece for that reason: customers want a soft layer for early-morning golf outings or office cold spells that won't add bulk under a rain shell. Because the pile is short and dense rather than long and loose, microfleece takes a small embroidered logo cleanly at the left chest, though we still back it with a lightweight cutaway to keep stitches from sinking into the give of the knit.

Stick to embroidery, woven patches, or low-temperature heat transfers on microfleece. It shares polyester fleece's low melt point, so a standard plastisol screen print risks the same scorching or pile-crushing you'd see on polar fleece, just with less fabric to hide the damage.

Some buyers assume "micro" signals a weaker or lower-quality fleece. It's a different design intent, not a downgrade — microfleece is engineered for low bulk and layering rather than maximum warmth, so judging it against a thick polar fleece jacket by hand-feel alone misses the point.