Are these true to size? My son wears a size 14.

You should order a the Large size for your son. If you are between Jumpsoles sizes, always go UP in size, not down. (ie; You wear a 10.5 shoe? You should order Large Jumpsoles, not Medium.)

Is doing weighted squats with the jumpsoles on a good way to gain vertical?

Thank you for your question. I would suggest following the training program that is provided with your Jumpsoles purchase.

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The New JumpSoles Speed and Jump Training System v 5.0 Size: Adult Large

Product ID: 2185290

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⚡Boosts fast-twitch muscle fibers

👟Fits adult large sizes 11-14.5

📚Includes expert training manual & DVD/CD-ROMs

Description

🚀 Elevate your game, one jump at a time!

EXPLOSIVE POWER UNLEASHED - Train your lower legs to dominate every jump and sprint with fast-twitch muscle activation.
JOIN THE ELITE JUMPERS CLUB - Used by athletes who refuse to settle—don’t miss out on the jump revolution.
PRO LEVEL GUIDANCE INCLUDED - Step-by-step training manual and multimedia content ensure you master the system like a coach.
BUILT FOR LONGEVITY RESULTS - Durable, high-quality materials engineered to withstand intense training sessions.
TAILORED FIT FOR SERIOUS ATHLETES - Designed for adult large feet (sizes 11-14.5) to maximize comfort and performance.

The New JumpSoles Speed and Jump Training System v5.0 is a professional-grade training aid designed to build fast-twitch muscle fibers in the lower legs. It includes a comprehensive training manual and DVD/CD-ROMs to guide users through effective jump and speed workouts. Sized for adult large feet (11-14.5), this system is ideal for athletes aged 12 and up seeking measurable improvements in vertical leap and speed.

Specifications

Item Package Dimensions L x W x H	15.24 x 9.13 x 5.28 inches
Package Weight	1.85 Kilograms
Brand Name	JumpUSA
Manufacturer	JumpUSA
Part Number	43230-198078
Size	Adult Large

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