Super soft lightweight knit long sleeve tee from Lululemon. This does not have any tags so not sure what the fabric is but it is a stretchy performance-style knit and probably has some cotton, so not the sweat-wicking style of a running top. More athleisure, every day wear but also appropriate for activewear if you choose. No size tag but fits like a S. 
Length from shoulder: 26.5"
Bust: 32"
*measurements taken with garment lying flat; without stretching. Keep in mind that this has stretch.
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#14