1. Stable Blankets
Stable blankets, or night blankets as they're sometimes called are designed to be worn when the horse is kept in a stall. They can be insulated for warmth, or of lightweight fabric to keep the horse's coat clean. Generally, they are of a much lighter fabric than turnout blankets because they aren't expected to get the same wear and tear that a turnout blanket does. They may or may not have leg straps to prevent shifting.
2. Turn-Out Rugs
Turn-out rugs or blankets are made of durable, waterproof but breathable fabric, lined with quilting for warmth. They have sturdy belly, chest and leg straps. Many rugs are designed to sit high up on the neck and often have pleats and gussets at the shoulder and haunch to allow ease of movement. It's important to choose a turnout blanket that breaths, because a horse can sweat under a completely vapor proof blanket.
3. Coolers
Coolers and anti-sweat sheets come in different designs. They may be fitted like a stable blanket, or they may simply be a large square of fabric with a few ties on either side. Coolers are meant to absorb sweat, while preventing the horse from becoming chilled from any breezes that may be blowing. Square coolers are draped over the horse as its standing and these tend to slide off easily if the horse moves around too much. Fitted coolers may have standard straps and fastenings so they can be left on a horse in a stall safely. All will be made of a fabric that is breathable and wicks away moisture. Summer coolers may be made of a mesh or thin fabric and less warm then ones intended for cold weather use.
4. Rain Sheets
A rain sheet is made of waterproof fabric and may be lined with a thin cottony lining. The purpose of the rain sheet is to keep the horse dry in wet weather. It's very important to buy a rain sheet made of breathable fabric. In warm weather, horses can quickly become over-heated and sweat in a rain sheet. I have one that is not made of breathable fabric, and it only comes out at shows, to be loosely draped over my saddled horse to protect all from the rain. Putting a rain sheet on in cold weather may not be a good idea. While it will block the wind, it will also mat down the hair, preventing the piloerection of the coat that keeps a horse naturally warm, without having any insulating properties of its own.
5. Fly Sheets
Fly sheets can be simple mesh blankets that look like a cooler made of gauzy fabric, or they may be more form-fitting, with gussets, leg and belly coverings. The purpose is to keep biting insects off of your horse. Many offer UV protection to prevent the horse's coat from getting bleached and dry. I'm not a big fan of fly sheets, as I've watched horses wearing fly sheets bite, kick and swish at flies with as much vigor as the horses standing next to them not wearing blankets. Horses wearing a fly sheet in the hot sun may be warmer than those that are not. The only time I use a fly sheet is at a horse show. Fly sheets need to be sturdy and well fitted. The tend to rip and shift easily. Here is a review of a fly sheet we’ve used.
6. Therapeutic Blankets
Therapeutic blankets can be made of special nano-fabrics that are purported to warm and soothe muscles, have magnets attached to them, or other technology that is supposed to heal and relax your horse. These blankets can be very costly. Follow the manufacturer's directions for use and care for the best results.
7. Under Rugs
These are insulating blankets that can be worn under a stable or turn out rug as a liner for extra warmth. Traditionally, they were made of wool (in colorful plaid designs) but now they can be quilted or fleece fabrics. They may have belly and chest straps, or they may only have fasteners to attach it to the outer blanket.
8. Half sheets, Quarter sheets and Rump rugs
Half sheets, quarter sheets and rump rugs are meant to be used while the horse is being ridden. They keep the horse's large muscles warm and covered during cold weather. If your horse wears a winter turn out rug, a rump rug is a good idea to prevent chills as you warm up. There are several different designs. Some only cover the horse's haunches, some cover the horse from the shoulders back, with the saddle sitting on top of it, or some will cover the horse from chest to haunch, and the rider. I worry that the type that covers horse and rider can cause big problems if the rider falls off, as there is a potential for the blanket to become entangled and the rider not fall free of the horse. Rump rugs and quarter or half sheets may be covered in wind and waterproof fabrics, wool or quilted fabrics.