You can't seal your horse in a fly-free zone but Endure Sweat-Resistant Fly Spray for Horses is the next-best option. Its unique formula keeps on working—even in wet conditions such as sweat and rain. Protect your horse from biting and nuisance flies, gnats and deer ticks that may transmit Lyme disease.

Stays active and keeps working, even in wet conditions
Provides up to 14 days of fly control
The only fly spray with RepeLock conditioner, which binds to the hair shaft
Protects against biting and nuisance flies, gnats, ticks and lice
Repels and kills deer ticks that may transmit Lyme disease
Provides repellency and quick knockdown of mosquitoes
Contains Cypermethrin, Pyrethrins, Piperonyl Butoxide, and Butoxypolypropylene Glycol
Available in 32 oz. ready-to-use spray and gallon Easy Pour sizes
Also available in 15 oz. continuous spray size