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What we can help with

  • Testing question. Ask how a performance piece was worn, washed, scored, or compared.
  • Correction or evidence. Send a factual correction, source document, or product-spec update.
  • Methodology. Discuss our fit, fabric, durability, or value-review process.
  • Commercial disclosure. Ask about affiliate relationships, samples, or commercial boundaries.

Meet our editors

  • Portrait of ESSER INDEX performance apparel editor Mara Stein
    Mara Stein Performance Apparel Editor

    Mara leads field-wear sessions for running shells, training layers, and commuter apparel, translating fit and durability notes into practical verdicts.

  • Portrait of ESSER INDEX materials and fit research editor Jonas Keller
    Jonas Keller Materials & Fit Research Editor

    Jonas audits textile claims, records wash-cycle changes, and compares construction and value across performance apparel categories.