El blog del Bullpen

The Caribbean Series, explained
Founded 1949 in Havana. The DR's all-time dominance. Mexico's recent rise. Why winter ball still matters for MLB careers — and why the Kachi heritage program traces back here. Leer más...
The first glove buying guide — for parents who didn't grow up with the sport
Direct help for first-time baseball parents. How sizing actually works, why position matters more than age, what NOT to buy, what to expect at each age band. Leer más...
What to do when your glove gets wet
Triage, controlled drying, conditioning, reshaping. Step-by-step rescue when your Kachi takes on water — rain, mud, sweat, even the washing machine. Leer más...
Japanese Kip vs American steerhide: a working pitcher's leather guide
What Japanese Kip leather actually is, why it became the professional standard in NPB and CPBL, and how it compares to American steerhide on weight, durability, and break-in. Plus the legitimate trade-offs nobody else will tell you about. Leer más...
The Latin & Caribbean baseball pipeline
A long-form essay on the genealogy of modern Major League Baseball. From Roberto Clemente to Mariano Rivera to Miguel Cabrera — eleven nations whose flags we embroider for free on every Kachi glove, because they are not a marketing decision. They are the lineage of the sport. Leer más...
Why pitchers design better gloves
Pitchers see the most defensive events on a baseball field. They have the most information about what a glove actually has to do — and most of that information never reaches the product team. Kachi co-founders Julio Teherán and Carlos Castillo pitched professionally for 18 seasons combined. Leer más...
Julio Teherán on His Rookie Glove: A 2× All-Star's Spec Walkthrough - Kachi Sports
Julio Teherán on His Rookie Glove: A 2× All-Star's Spec Walkthrough
Julio Teherán walks through every decision he made when designing his first Kachi pitcher's glove — pocket depth, web style, leather, lacing, embroidery. In English and Spanish. Leer más...
Inside Kachi Baseball: A Day at Carlos Castillo's Miami Academy - Kachi Sports
Inside Kachi Baseball: A Day at Carlos Castillo's Miami Academy
Behind every Kachi glove is a Miami academy run by a former MLB pitcher. A photo-essay walkthrough of a Saturday morning at Kachi Baseball — the cages, the kids, the... Leer más...
Kachi Gloves vs. Wilson A2000: A Former MLB Pitcher's Honest Comparison - Kachi Sports
Kachi Gloves vs. Wilson A2000: A Former MLB Pitcher's Honest Comparison
The Wilson A2000 is the most-searched custom baseball glove in the United States. It's also genuinely good. Here's how a Kachi custom build stacks up — where Wilson wins, where... Leer más...
Japanese Kip vs. Steerhide vs. US Kip: What Leather Actually Matters - Kachi Sports
Japanese Kip vs. Steerhide vs. US Kip: What Leather Actually Matters
From a former NPB and CPBL pitcher: why Japanese Kip is the professional leather standard in Asia and the Majors, how it actually differs from US steerhide, and what that... Leer más...
How to Customize a Baseball Glove: A Former MLB Pitcher's Guide - Kachi Sports
How to Customize a Baseball Glove: A Former MLB Pitcher's Guide
Carlos Castillo walks through every decision in a custom baseball glove build — position, size, leather, web, pocket depth, lacing, embroidery — with the reasoning he uses at his Miami... Leer más...
Baseball Glove Oil vs. Conditioner: What Actually Works - Kachi Sports
Baseball Glove Oil vs. Conditioner: What Actually Works
Oil vs. conditioner vs. saddle soap vs. mink oil vs. shaving cream (don't). Carlos Castillo on what 18 years in pro baseball taught him about keeping a glove alive for... Leer más...