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Neoprene
THE NEOPRENE BOTTLE SLEEVE SIZE: Diameter 2 inch, height 7 inch. If the diameter of your bottle between 2 - 2.6 inch (5-6.6cm), then it would fit. In other words, it fit for 12 to 18 oz glass or plastic bottle.
STRETCHY MATERIAL: The sport bottle sleeve is made of durable neoprene. It feel soft, stretchy and lightweigh, keep water cool or warm, and keep bottles from sweating. The sleeves rim hugs the bottle snugly, easy to take on and off.
SAFETY: The material harmless to human. A small cute hole at the bottom lets air out, which can make it easy to push in and pull out; Finger strap is strong to hold the bottle. It will protect your bottle from scratch damage and against hot.
MULTI-PCS: The portable insulated sleeve included 8 black. They will meet your need for quantity.
GOOD INSULATION: The drink bottle sleeve is suitable and very convenient for indoor and outdoors use, such as camping, swimming, driving, fishing and other activities. It is machine washable and easy to clean, weather resistant.

Kvvdi 8 Pack 12 oz - 18 oz Neoprene Water Bottle Sleeve 16.9 oz Insulated Glass Drink Bottle Cover
Color information:
gray, teal, navy, black, yellow, pink, green, dark pink
Size information:
Bottom diameter range: 2 - 2.6 inch (5-6.6 cm)
Height: 7 inch (18cm)
Fit for 12 oz - 18 oz bottle (such as 12 oz 14 oz 16 oz 16.9 oz 17 oz 18 oz ...)
Material: Neoprene, No irritation of the smell, the material harmless to human.
Functions:
1. Eliminated the problem of water bottle sweating and wetting your stuff.
2. Keep your beverage cold or hot longer than without.
3. Help your hands to against hot or cold water.
4. Let the bottle more portable. Finger strap is strong to hold the bottle.
5. Stay away from monotonous. 8 pack make you bottle more stylish and meet your need for quantity and colors
6. Protect your bottle from scratch damage.
7. Reduce your anxiety about breaking the glass.
It is really affordable for 8 pack of bottle sleeves. You can use different color every day and enjoy your life.
About some Q&A:
Q: Are they solid colors?
A: Yes, there is no logo or other mark on it.