SLEEP MASK
1. Is the sleep mask adjustable? 
Yes. The dual elastic straps on the sleep mask have adjustable tensioners that allow the user to achieve the optimal performance and comfort level.
2. What are the sleep masks made of?
The sleep masks are made of a smooth, non-irritating, satin-like material called sateen. The material is black in color.
3. Will the sleep mask block out all of the light?
Yes. If adjusted and worn according to the directions, the sleep mask will (for most people) stop the transmission of all light.
4. Is the sleep mask washable?
The sleep mask may be gently wiped down with a damp rag. More aggressive cleaning or washing could compromise their integrity. Allow the sleep mask to air dry.
SOFT FOAM EARPLUGS
1. What are the foam earplugs made of and do they contain latex?
The earplugs are made of urethane foam. The "latex" in our foam earplugs is not natural latex, it is a synthetic latex technically called an emulsion polymer. It has the same properties as latex (water based, adhesive, etc.) but does not have the enzyme problem associated with natural latex and is hypo-allergenic.
2. Can the earplugs be cleaned?
No. If these earplugs become soiled, they should be disposed of.
3. Besides reducing noise, can these earplugs be used to seal out water?
No. These earplugs were specifically designed to provide superior protection against noise. For water protection, we recommend that you try one of Mack's® moldable silicone or pre-molded flanged earplug products.
4. Are there any application tips to help me get a proper seal with the earplugs?
First try re-inserting the earplugs after carefully re-reading the directions. Be sure to insert the plug while pulling (with the opposite hand) up and back on the outer ear to straighten the ear canal. If you are still unsuccessful with a plug that has now warmed to body temperature, try another "cooler" plug. A plug that is cooler in temperature will retain its compressed shape and rigidity slightly longer, sometimes making it easier to insert. A sign that the earplug is sealing properly is that your own voice will sound more internal and exaggerated.