ON Performance Long-T Running Shirt - Men's LG Olive EUC The casual, quick-drying long-sleeved t-shirt for before, during and after runs. Works as a standalone top or as a base layer. The Comfort Long-T features a polyester-wool blend in a special fiber construction to offer the breathable comfort and anti-odor properties of wool without the itch. Hydrophilic and hydrophobic fibers work together to wick moisture from the skin to keep you cool and dry at home, at work, or in your workout.