Nettex Equine Standard Fly Repellent is a popular and trusted product formulated for horse's with sensitve skin. Suitable for everyday use making it easy to effectively repel flies, stable flies, and all biting insects, keeping your horse or pony comfortable and happy at all times. This Deet-based spray also contains moisturisers and conditioners. Scored 8/10 on Horse & Hound Best Fly Sprays Test 2019. Size Guide Available in sizes - 250ml, 500ml, or 2 Litres.