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The 4APP Plyo Ball System is a 7-piece velocity training set engineered for elite pitchers and competitive arm development. Featuring a gapless overload-to-underload weight spectrum, a humidity-resistant engineered shell, and a revolutionary half-seam dual-feel design, this system provides unmatched biomechanical grip and authentic pitch feel across all training environments.
- Humidity-Resistant Grip: Features a proprietary composite shell texture that maintains a clean, consistent hold in sweat and high heat, eliminating dangerous over-gripping.
- Dual Feel Half-Seam Architecture: Engineered with one side featuring realistic raised seams for pitch shapes, and a completely smooth side for constraint-based mechanical training.
- Cohesive Weight Spectrum: A complete 7-piece progression covering 3.5 oz up to 4 lbs, completely eliminating weight gaps for smooth biomechanical scaling.
- Optimized Rebound Control: Dialed-in wall thickness guarantees durable, controlled rebound profiles off hard facility surfaces to prevent unpredictable ricochets.
Lock in your grip. Level up your game.
The 4APP Square Rosin Bag is made for pitchers who want that solid grip without overthinking it. Whether you’re getting your work in on a bullpen day, chasing velocity, or just need something that actually works, this bag’s got you. Built to be simple, durable, and effective - nothing fancy, just what you need.
Key Features:
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10oz square-style rosin bag
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Dark rosin blend from South Georgia pine
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Absorbs sweat fast and keeps your hand dry
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Heavy-duty polyester shell built to last
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Same stuff we use in our own training
From high school fields to pro bullpens, this bag shows up every day.
Please allow 1 to 3 business days for order processing before shipping.
Stop guessing. Start tracking.
The TAG One Sports Radar is the official radar used by 4APP to measure real performance. Whether you’re throwing bullpens, hitting in the cage, or training on your own, this gives you instant, accurate velocity and exit velo so you actually know what’s working.
If you’re serious about improving, this is where it starts.
KEY FEATURES
- +/- 1 MPH accuracy for reliable velocity and exit velo tracking
- Tracks both pitch velocity and exit velocity in real time
- Directional filtering so you only capture the reps that matter
- Bluetooth connectivity with iOS and Android app for session tracking
- Stores session history and player data so you can monitor progress over time
- 130-foot range for flexible setup in bullpens, cages, or on-field
- Ultra-compact design (57% smaller than most radars) so you can train anywhere
- Internal lithium-ion battery with up to 6 hours of continuous use
- Multi-sport functionality (Baseball, Softball, Golf)
The Trevor Bauer Pitching Masterclass is a comprehensive digital training curriculum built for competitive pitchers. Designed by a Cy Young winner, this program focuses strictly on pro-level mechanics, breaking down the delivery stage by stage to eliminate physical leaks and build a more efficient, repeatable motion, without relying on expensive tracking equipment.
- Mechanics and Kinetic Sequencing: Breakdowns focus on maximizing kinetic sequencing and creating separation to build a highly efficient, repeatable delivery.
- Stage-by-Stage Breakdown: Setup, load, stride, arm action, and follow-through, covered step by step the way a Cy Young winner evaluates mechanics.
- Built for Repeatability: Learn what a clean, efficient delivery actually looks like so you can train toward it start after start.
- Lifetime Access: Download and watch at your own pace, anytime, anywhere.
Put in the work. Wear the proof.
The 4APP x Bauer Outage Street Tee is the first drop to put both marks on one garment. Heavyweight, garment-dyed, and built for the guys who actually do the reps.
Who's it for?
For players who train on purpose.
• Runs a real throwing program
• Chases numbers, not hype
• Shows up in the offseason
• Lets the work do the talking
Two brands. One standard.
4APP builds the arm.
Bauer Outage refuses to apologize for it.
Same work ethic.
Two ways to wear it.
One shirt.
Part of the Momentum Streetwear Collection. Baseball culture translated off the field.
Ships in 2-4 business days
SIZE CHART
| Size | Chest Width | Length |
| S | 18 1/4" | 26 5/8" |
| M | 20 1/4" | 28" |
| L | 22" | 29 3/8" |
| XL | 24" | 30 3/4" |
| 2XL | 28" | 31 5/8" |
How to Measure:
- Chest: Measured across the chest one inch below armhole when laid flat.
- Body Length at Back: Measured from high point shoulder to finished hem at back.
The game rewards skill, discipline, and competitive fire. We exist for players who want more than participation.
