Ƙungiyar ƙwallon ƙafa ta ƙasa, wadda aka fi sani da NFL, ita ce ƙungiyar ƙwallon ƙafa ta Amurka. Ƙungiyar ƙwallon ƙafa ta Amurka tana da girma sosai. Ƙungiyar ƙwallon ƙafa ta Amurka (AFC, Ƙungiyar ƙwallon ƙafa ta Amurka) da kuma Ƙungiyar ƙwallon ƙafa ta ƙasa su ne manyan taruka biyu da suka ƙunshi ƙungiyoyi 32 na gasar (Taron ƙwallon ƙafa ta ƙasa, wanda aka fi sani da NFC, Ƙungiyar ƙwallon ƙafa ta ƙasa). Ƙungiyoyi 16 daga kowace ƙungiyar tarayya an raba su zuwa ƙungiyoyin Gabas, Kudu, Yamma, da Arewa. Kowace ƙungiya ta ƙunshi ƙungiyoyi 4.

A takaice dai, muna kiransu rigunan offset. "Kwafi na sigar rigar" yana nufin cewa kamannin yana kwaikwayon sigar ɗan wasa, amma yadi, girma, da nau'in tufafin sun bambanta sosai da sigar ɗan wasa, bisa ga fassarar Turanci kai tsaye. Lambar, tambarin ƙungiyar da ke kan hannun ɗan wasa (idan akwai), da'irar da ke kan hannun (idan akwai), da tambarin Reebok duk an buga su ne a kan siririn yadi na rigar offset. Sabanin sigar ɗan wasa, wacce ta dace da kayan kariya, sigar buga offset na rigar ta dace da sawa ta yau da kullun.

An raba nau'in rigar masoya zuwa manyan riguna (manya), matasa (Youth Jersey), da kuma na mata domin ya dace da alƙaluma daban-daban (Women Jersey). Mafi shahara kuma wacce aka saba da ita ita ce ta manya. Rigar matasa tana zuwa ne a girma ga yara 'yan shekara 8 zuwa 10, kuma lambar da tambarin NFL suna da ɗan ƙarami. Sigar jariri ba ta da sarkakiya kuma ta fi sauƙi fiye da sigar manya. Sigar mata ta riga tana da kayan adon kugu don dacewa da jikin mace. Ba a bayyana ta dalla-dalla ba.