A relaxed fit jersey is cut looser, similar to a casual athletic shirt, giving you maximum comfort and freedom of movement on the bike. It's the best choice if you ride recreationally, commute, bikepack, or simply prioritize feeling comfortable over going fast.
The trade-off is that the extra fabric creates more drag at higher speeds and doesn't manage moisture quite as efficiently as tighter-fitting options. If you're cruising at moderate speeds or stopping at coffee shops, you likely won't notice these downsides at all.
Choose relaxed fit if you never feel the need to tuck for speed, prefer a jersey that doesn't cling to your body, or want something that looks natural off the bike too. It's also great for riders who find tighter jerseys restrictive or uncomfortable on longer, easy-paced rides.