adidas +F50.9 Tunit

The +F50.9 Tunit, worn by Messi from November 2008 through May 2009, is generally regarded as his first genuinely "signature" F50 boot — the first to receive a dedicated colourway built specifically around him rather than shared generically across adidas's athlete roster. It carried him through the first half of Barcelona's unprecedented sextuple-winning 2008–09 season before he transitioned to its successor, the +F50i Tunit, in May 2009 (see the companion file adidas F50i Tunit 2009).

• 1 November 2008: The +F50.9 Tunit releases, reintroducing a seamless lace-cover design (a callback to the very first F50) built on an engineered lightweight microfibre synthetic "AdiGrip" upper.
• November 2008 – May 2009: Messi's primary boot through the second half of the 2008–09 Barcelona season, worn in the "Silver/Blue" colourway described by SoccerBible as his first dedicated signature F50 shoe.
• During this period, Messi scored Barcelona's 5,000th goal in La Liga history against Racing Santander, and wore the F50.9 through Barcelona's famous 6–2 demolition of Real Madrid at the Santiago Bernabéu (2 May 2009) as part of the club's treble-winning run-in.

Continued the core interchangeable TUNiT philosophy (swappable upper, chassis and stud modules) while reintroducing the clean, seamless lace-cover construction that had defined the very first F50 from 2004 — a deliberate design callback after the more overtly modular, plasticky-feeling look of the F50.6/F50.7/F50.8 generations. The upper used an engineered lightweight microfibre synthetic material referred to as "AdiGrip," intended to improve both weight and ball-control texture versus earlier TUNiT uppers.

The F50.9 Tunit "Silver/Blue" colourway is described as Messi's first dedicated signature F50 shoe — a boot built with his identity specifically in mind rather than shared generically with other adidas athletes, marking an inflection point in how adidas marketed him.

This boot marks, in a real sense, the moment adidas's Messi strategy shifted from "sponsored player wearing team-issue boots" to "global brand ambassador with boots built around his identity." The Silver/Blue F50.9 Tunit is generally regarded as the first step in that shift, and it happened to coincide with arguably the greatest single season any club side had produced to that point: Pep Guardiola's Barcelona won an unprecedented sextuple in 2009 — La Liga, the Copa del Rey, the Champions League, the Spanish Super Cup, the UEFA Super Cup, and the FIFA Club World Cup — with Messi at the heart of it, playing a free-roaming false-nine role that redefined the position.

• 2 May 2009: Barcelona thrash Real Madrid 6–2 at the Santiago Bernabéu in El Clásico — a signature result of the treble-winning campaign, with Messi in the Silver/Blue F50.9 Tunit.
• 13 May 2009: Barcelona beat Athletic Bilbao 4–1 in the Copa del Rey final, with Messi among the scorers, securing the second leg of the sextuple.
• Season-long: Messi also scored what several sources describe as Barcelona's 5,000th goal in the history of La Liga, against Racing Santander, while wearing the F50.9 Tunit.