TheDefeet tank is slightly thicker than the Un-D-Lite but still very thin,Un D-Shurt works well for layering even in warm climates. In cooler temperatures, just layer on another Un-D-Shurt or an Un-D-Flector.
Defeet UN.D.Shurt Sleeveless White Small Lightweight Base Layer Top
DeFeet Wooleator D-Logo 6" Merino Cycling Running Socks - Charcoal
HOPE BIG'UN 20MM / QR / TANDUM FRONT HUB BEARINGS BIGUN BIG UN
MET Idolo Blue Metallic UN Road Bike Cycle Helmet - M 52-59 cm
20G Full Carbon Fiber Bicycle Water Bottle Cage 2PCS Ultralight MTB Road Bike Un
MET IDOLO MIPS Black UN Road Gravel Touring Bike Helmet Medium