Related Clues:

• On one's ___ (alert)
• Low digits?
• Hose fillers
• Tacks
• Web sites, at times
• "Little piggies"
• They're painted by pedicurists
• Ostrich quartet
• Toughness exemplar
• The ten in "hang ten"
• Slipper tips
• Digital water testers?
• Parts of a foot
• Fastens securely
• They may be painted