You can attempt to isolate the lats with resistance bands by performing tube
pull overs. To set up the exercise you have to position a stability ball (can
use a bench or even the floor instead) far enough away from the origin of the
resistance bands so it stretches slightly. Lie down facing away from the
resistance band and from a supine position (lying, facing up) keep your arms
straight (slightly bent, not locked) and pull the resistance through the whole
range of motion.
If you don't like the feel of tube pullovers and have access to a full
set of gym equipment,
dumbbell pullovers or
high cable straight arm lat pulls may be better options. Since
straight arm pulls are an accessory isolation exercise they are only
beneficial for those looking to build the lats. The vast majority of the
time the straight arm pulls will be one of the very last exercises during
any workout that attempts to target the lats and upper back.