Does not breath well.

I thought with the bright colored summer theme these long sleeves (I bought 3) would be okay for wearing in the sun/heat/summer activities.  I have not found that to be the case.  Bright colors to catch the eye and okay in cooler weather, but definitely not breathable fabric.

About the same time I purchased several Joe's USA Koloa Surf Moisture Wicking Long Sleeve Graphic Shirts which are comparable, but true to advertised comfortable in the heat/sun/summertime.

Depends on your needs, but not summer comfortable.