The Rep teams will play an 18-20 game season within the North Waterloo Rural Minor Softball League. The season runs from early May until early August. The League wraps up its season with a final double knockout weekend tournament in August. Confirmed dates and tournament sites are set at League spring meetings. More NWRMSL information can be found by visiting their website at nwrmsl.ca
The KW Twins Rep teams play their home games out of Wilson Park in Kitchener and Hillside Park in Waterloo. The Rep teams also usually participate in two weekend OASA tournaments and one or two Invitational weekend tournaments. Usually Rep team rosters are selected in the early spring and confirmed by mid-April. Any registered KWMBSA player is welcomed to try out for the appropriate Rep team. Rep Divisions are based on Softball Canada's age groupings.
- Mite is under 10 as of January 1,
- Squirt is under 12 as of January 1,
- Peewee is under 14,
- Bantam is under 16 and
- Midget is under 19;
as of January 1.
The extra fee above basic house league registration fee is $100.00 to play Rep fastball and is payable by May 1.