Check out Coastal Pet's video, above, that shows just how reflective the Lazer Brite collars and leashes are.
 
We really like Coastal Pet Lazer Brite® adjustable collars and leashes. Their unique design offers the ultimate in reflective technology. Overlaid designs maximize reflectivity while showcasing vibrant colors and patterns beneath so that your dog shines day or night. Featuring the same 3M reflective material used by safety professionals, these collars are visible to oncoming motorists from 600 feet. Sturdy woven nylon mesh, metal D-ring, and durable molded quick release buckle make this a great collar--perfect for that nighttime walk!
 
Offering four patterns
Blue Lagoon Wave
Purple Daisy
Pink Zebra
Orange Abstract Rings
 
Two sizes
5/8" x 12 - 18" Length
    1" x 18 - 26" Length
 
Before deciding the size, please take a moment to measure your dog's neck, using a cloth measuring tape or string, twine, etc. Measure, wrapping the tape or string about as tightly as the collar should sit on your dog's neck--not too tight. If using string, then hold the final length up to a ruler or yardstick to determine its length. If in doubt, go to the next larger size--you can always adjust a collar that is slightly too big, not so much with a collar that's too small. This will help prevent an exchange, which just wrecks everyone's day!  : )