Great Base layer by Gorilla Wear.

This is their Smart Tights with cell phone pocket.

New with tags.

I included screenshots from their website to give you more product info and photos of how they fit. The color is not the same but the item is the same. Hope it helps.

Very well made. You can feel the quality on the fabric and the construction. 

Men's size 3XL.  Measurements are in the photos.

Thank you