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
SHIMANO Cycling D/D Shimano adaptalla Claw Rear CTRA 160 mm D D, Black, Uni UK
MET Idolo Blue Metallic UN Road Bike Cycle Helmet - M 52-59 cm
MET IDOLO MIPS Black UN Road Gravel Touring Bike Helmet Medium