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Available both stock/untouched and Heat Rolled with Progressive Pressure - choose your preference during checkout!
The Proton Series 4 Hot Butter One-Piece USA/ASA Slowpitch Softball Bat features a 12.75-inch barrel and one-piece composite construction, providing a firm, direct feel with a compact and controlled hitting surface.
Built with Proton's new Series 4 Technology, the Hot Butter is designed around consistent barrel performance, durability, and a responsive one-piece feel through contact. The 12.75" barrel provides a versatile combination of hitting surface and barrel control, while the one-piece construction creates a direct connection between the hands and barrel.
The Hot Butter is available in three swing-weight configurations: Balanced, .5 oz Endload, and 1 oz Endload, allowing players to choose between a more evenly distributed swing feel or progressively more mass concentrated toward the end of the barrel.
Built to Maximum Allowable Performance within USA Softball standards, this model features a Linear Design and carries no ball restrictions.
- Brand: Proton
- Diameter: 2-1/4 inch
- Certification: ASA/USA
- Frame: One Piece Composite
- Linear Design
- New Series 4 Technology
- No Restrictions on Balls the bat can handle
- Maximum Allowable Performance
- Warranty: NONE
- Barrel Length: 12.75"
- Year Released: 2026
- Adding our Heat Roll with Progressive Pressure to your order may cause decertification, check with the governing body of your league for clarification
Manufacturing tolerances, performance considerations, and grip weight may cause variations from the listed weight.
OPTION GUIDE: Should I order this bat stock/untouched or Heat Rolled with Progressive Pressure?
If you order your new bat Heat Rolled with Progressive Pressure, it will be delivered to you completely and evenly broken in. This process adds 20-40ft of distance to your solid hits, increases consistency, improves durability and adds 2-3 business days of lead time to your order. If you plan to use the bat in an official game or event, please verify the legality of our process with your league or sanctioning body before use. We (LongballBats.com) do not encourage the use of a Heat Rolled bat in any game or event where it is against the rules. Click here for details about our process!
