RLX Ralph Lauren LS Solid Mock Golf Shirt French Navy AW14. RLX Base Layer Shirts for Autumn/ Winter 2014. Finished in this navy colour way with an RLX logo featured at the mock neck, this long sleeve base layer top is perfect for golf in cooler conditions this season & is sure to keep you warm & comfortable on the course. Wear under any RLX performance shirt for a great looking combination which will provide maximum warmth & comfort throughout your round.