Related Clues:

• Shipping cushion, perhaps
• Top of a draft
• Fire extinguisher's output
• Latte topper
• White water stuff
• "... oceans, white with ___"
• Shaving cream choice
• Head in a stein
• Tear-resistant synthetic rubber
• Shaving gel alternative
• Mug overflow, perhaps
• Flat beer's lack
• Fire suppressant
• Bud head
• Bubbles