World Rugby recommends layering as conditions and activity change, with flexibility for players to adjust clothing. For matches, Law 4 requires clothing to comply with Regulation 12 and specifically lists cotton-blend long tights or leggings under shorts and socks; ask your union or match officials about any under-jersey base-layer top.
Rugby base layers can be useful training clothing in cold conditions, but training comfort and match eligibility are separate questions. World Rugby’s cold-weather guideline recommends layers as conditions and activity change, while Law 4 sets rules for clothing worn in a match.
Training layers and match clothing
| Use | What to check |
|---|---|
| Training and warm-up | Choose a layer that fits beneath the jersey and can be adjusted as activity or weather changes |
| Match jersey | Check Law 4, Regulation 12 and the union or competition policy for extra garments |
| Lower-body layer | Law 4 specifically describes cotton-blend long tights or leggings with one inside leg seam, worn under shorts and socks |
| After training | World Rugby advises players to bring a change of clothing for after a session or match |
Law 4 says all clothing must comply with Regulation 12. Its additional-items list includes washable supports, approved protective items and the specific tights or leggings rule above. It does not list an under-jersey base-layer top there, so do not assume a training top is match-permitted without checking with the club, union or match officials.
Compare the garment details
Check the size chart for the exact model, especially if the top will be worn beneath a close-fitting shirt. Gilbert’s Atomic II product page describes a brushed inside, flat-locked seams, a polyester-elastane fabric composition and adult sizes from 2XS to 3XL. Those are details for that product; other base layers use different fabrics, seams and size ranges.
Review the care label and the maker’s directions before washing. If the player wears a protective garment over the layer, check that both pieces sit as intended and that the outside clothing still follows the required match rules. Compare the rugby jersey fit guide, the World Rugby clothing rules guide and shoulder pads and protective vests. Browse rugby kit and apparel.
Sources
Common questions
Can I wear a base layer for rugby training?
World Rugby's cold-weather guideline says clothing needs can change with conditions and activity, and recommends layering as needed.
Are rugby base-layer tops allowed in a match?
Law 4 requires clothing to comply with Regulation 12. It does not name under-jersey base-layer tops in its additional-items list, so check the applicable union or competition policy.
Does Law 4 mention leggings?
It permits cotton-blend long tights or leggings with a single inside leg seam, worn under shorts and socks.
What should I check when buying a base layer?
Compare the maker's size chart, fabric composition, seam placement and fit beneath your jersey.