Hand-Tied Construction This hay net was tied by hand, so the hole size may vary slightly. The average hole size for this net is approx. 2x2”, which is the most commonly used and recommended opening size for slow-feeding the average horse. This size net opening will prevent excess hay wastage, while slowing down your horse's feeding rate to a more natural, grazing-style pace. This size hay net is rated for use with any type of hay. For smaller horses and livestock animals, a smaller hole size may be necessary if the animals are able to pull hay too quickly from this style of net. UV, Mold, and Mildew Resistant This world class Derby Originals hay net is made from a polyester rope that is extremely resistant to damage from UV rays, or mold and mildew. These hay nets have been tested in wet and damp conditions and have held up strong, with no damage or smell, even when hay was left to completely rot in them. These hay nets are great for those who have to soak their animal's hay, for all-season use, or use outside in the pasture. Product Specifications Net Material: Polyester Hole Size: 2x2” Net Length: 48” Hardware: Yes Hardware Type: Nickel Plated Hanging Rope: Yes UV Resistant: Yes Mold/Mildew Resistant: Yes Available Colors: Yellow, Black, Royal Blue, and Red