Features:
Great for short haired dogs and those without an undercoat
Breathable and water-resistant material
Adjustable back length
3M reflectors
Protects the chest and key muscle groups
Item Specifications:

Sizes:
8in: Back Length 8", Neckline 14", Chest 10-20"
10in: Back Length 10", Neckline 16", Chest 12-22"
12in: Back Length 12", Neckline 19", Chest 12-22"
14in: Back Length 14", Neckline 21", Chest 14-26"
16in: Back Length 16", Neckline 22", Chest 18-30"
18in: Back Length 18", Neckline 24", Chest 18-32"
20in: Back Length 20", Neckline 26", Chest 20-35"
22in: Back Length 22", Neckline 28", Chest 22-38"
24in: Back Length 24", Neckline 29", Chest 22-39"
26in: Back Length 26", Neckline 32", Chest 22-39"
28in: Back Length 28", Neckline 33", Chest 24-43"
32in: Back Length 32", Neckline 37", Chest 24-43"  

Measuring Your Dog:
1. Back length: should be measured from the withers (not the collar) to the base of the tail, while the dog is standing in normal position.
2. Neckline: should be taken at the base of the neck, this being the widest point of the neck.  The neckline of an overall can be larger than the circumference of the dog's neck, as it can be adjusted to fit a smaller neck.
3. Chest: should be taken at the widest point of the chest, from behind the front legs.  To ensure sufficient freedom of movement, the chest of an overall should be wider than the dog's chest.