This is an 8-foot high by 12-foot long polyester-2 U.S. Flag.
At ApexFlags.com we believe the 8' x 12' size is the best medium size U.S. Flag that will last the longest before tattering. The reason for this is: a 8' x 12' is a 1:1.5 hoist to fly ratio U.S. Flag and therefore shorter then a 1:1.6 or 1.9 hoist to fly ratio. Shorter means less stresses on the material at the fly end of a U.S. Flag.
When you construct with polyester-2, like the Flag on this page, then you get maximum staff duration in low to heavy winds. The only winds this Flag will do poorly in is: extended severe winds, say over 40-mph often. So for most of us then this 8' x 12' polyester-2 U.S. Flag is the best medium size option.