GMP-3000 Mizuno Pro 13" Baseball First Base Mitt

13 in
Web not stated
Kip
Break-in stiff
Closing hard

GMP-3000 Mizuno Pro 13" Baseball First Base Mitt, first base mitts: photo from Mizuno — Photo: Mizuno

Facts as the maker states them, read 20 Oct 2026

The GMP-3000 is a 13-inch Mizuno Pro first base mitt offered in right- and left-hand throw. It is made of Deguchi Northern European kip leather with professional-level lace and professional patterns, and the page describes a break-in that shapes the mitt to the hand.

Type	First base mitt
Size	13 in What this means Measured from the heel to the top of the index finger. Infielders use smaller gloves (10.25 to 11.75 in) for quick transfers; outfielders larger (12 to 12.75 in); first base and catcher's mitts are measured differently. Tip: Bigger is not better for a young infielder. A glove they can close beats a glove that looks like a pro's.
Leather	Deguchi Northern European Kip Leather What this means Light, tight-grained leather from young cattle. The premium choice for pro infield gloves: light and long-lasting, but stiff at first.
Hand	Right-hand throw or left-hand throw
Level	serious athlete
Also on the page	Recommendations: Middle Infielders, Shortstops and 3B Deguchi Northern European Kip Leather: Hand selected and impeccably conditioned Player Pocket Designs: Pockets tailored specifically to the player's needs and how they prefer to break-in their glove Comfortable, hand based patterns: Sets your pocket under the web and helps to shape your glove like a pro Professional Level Lace: Same durable lace that's offered in our professional-level gloves Professional Patterns: Glove patterns created for the best players in the world
Maker SKU	313197RG901300
The maker says	Deguchi Northern European Kip Leather is hand selected and impeccably conditioned. Professional patterns created for the best players in the world. The longer break-in time gradually shapes to and memorizes the nuances of your hand for a personalized fit. Meticulous construction guarantees both resilience and a luxurious feel. Favored by elite baseball players.
Source	usa.mizuno.com, product page, read 20 Oct 2026

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$450.00maker’s price, read 20 Oct 2026

See it on Mizuno's siteNo buy route yet: this link goes to the maker, and we earn nothing from it.

Fit profile

Stated comes off the maker's page; derived is worked out from what the maker states: its words, its leather, its numbers; graded is Patrick's call; unknown means the class is not known yet.

LeatherstatedKip
Break-instatedStiffStated: page says stiff or break-in required.
What this means
Pro-grade leather such as Japanese kip or steerhide. Can take weeks to months to break in and a young player may not be able to close it at all at first. Lasts for years once broken in.
Tip: Do not buy a stiff pro glove for a player under 12 unless you are ready to break it in for them.
Closing effortderivedHardDerived: stiff build in a mitt or large pattern.
What this means
How hard a young hand has to squeeze to close the glove on a ball. Easy means a soft build and a smaller pattern; hard means stiff leather or a big mitt.
Tip: If your player drops balls that hit the pocket, closing effort is usually the reason, not the hands.
PocketunknownNot known
BackunknownNot known
Hand openingunknownNot known

Does it fit my player?

Compare with: SSK Baseball SSK Z5 Craftsman 13" Baseball First Base Mitt Z5-1300CML9, Rawlings R9 Series 13-Inch 1st Base Mitt, Vinci Pro 13 Inch First Base Mitt-CBW-22. Same kind of glove, same size.