Protection Factor: Available in SPF 15 or 30. The aloe-based formula helps your skin absorb it quickly, so SmartShield won't leave a greasy residue on you or your clothes. And it protects more than just your skin: It's biodegradable.

Friendly Factor: Small 2-oz. bottles fit easily into your jacket or daypack. Better yet, pocket-sized, single-use foil packs are a guarantee against messy spills. Or keep a gallon jug in the trunk of your car and apply in the lot.

Price: From $6.50

Info: http://smartshield.com/ target=_blank>smartshield.com