If you love the outdoors, my Sun & Sea Ladies Performance Long Tee is a must have. For it is wanderfully versatile: 
 
In and on the water, it is a UPF 50+ rash guard that can help protect you from sunburns and harmful UV rays as you snorkel, surf, kayak and more.
 
On a cold mountain day, it is a base layer that can keep you warmer and healthier.
 
On a tropical hike, its moisture wick, quick dry fabric can keep you cooler, whilst the long sleeves can help protect you from deadly mosquitoes.