Let young fans show their NFL team pride in this Youth San Francisco 49ers Brock Purdy Nike Black Carbon Fashion Game Jersey. Made from lightweight, breathable fabric for comfort, this officially licensed jersey features durable screen-printed player name and number details.Nike Youth NFL JerseysOfficially licensed NFL merchandise Durable, lightweight fabric for all-day comfortScreen-printed player name and numberV-neck collar and tailored fit for a sporty lookNike swoosh on shoulder:root{--pi-navy:#0b2c4a;--pi-navy-2:#0f3b62;--pi-border:#e6edf3;--pi-text:#0f172a;--pi-muted:#5b728a;--pi-card:#ffffff}.size-card{max-width:980px;margin:1.5rem auto;background:var(--pi-card);border:1px solid var(--pi-border);border-radius:14px;overflow:hidden;box-shadow:0 6px 20px rgba(16,24,40,.06);font-family:system-ui,-apple-system,Segoe UI,Roboto,Inter,Helvetica,Arial,sans-serif;color:var(--pi-text)}.size-card__header{background:linear-gradient(180deg,var(--pi-navy),var(--pi-navy-2));padding:20px 24px 18px;border-bottom:1px solid rgba(255,255,255,.12)}.size-card__header h2{margin:0 0 6px;font-size:clamp(1.15rem,2.2vw,1.55rem);line-height:1.15;letter-spacing:.4px;color:#fff;font-weight:800}.size-card__header p{margin:0;color:#d6e6f5;font-size:.95rem;font-weight:600}.table-wrap{overflow-x:auto}.size-table{width:100%;border-collapse:collapse;min-width:640px}.size-table caption{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;clip-path:inset(50%)}.size-table thead th{background:var(--pi-navy);color:#fff;text-transform:uppercase;letter-spacing:.06em;font-size:.9rem;padding:14px 16px;text-align:left}.size-table tbody td,.size-table tbody th{padding:16px;border-top:1px solid var(--pi-border);font-size:1rem;background:#fff}.size-table tbody th{background:#f8fbff;color:#0e2239;font-weight:700;width:42%}.size-table tbody tr:nth-child(even) td{background:#fcfeff}.tips{padding:18px 22px 22px;background:#f6f9fd;border-top:1px solid var(--pi-border)}.tips h3{margin:.2rem 0 .4rem;font-size:1rem;color:var(--pi-navy)}.tips ul{margin:.35rem 0 0 1rem;padding:0}.tips li{margin:.45rem 0;color:var(--pi-text);line-height:1.5}@media (max-width:640px){.size-card{border-radius:12px}.size-table{min-width:0}.size-table thead{display:none}.size-table tbody tr{display:grid;grid-template-columns:1fr 1fr;gap:0;border-top:1px solid var(--pi-border)}.size-table tbody th{grid-column:1 / -1;background:#f0f6ff;padding:14px 16px}.size-table tbody td{display:flex;justify-content:space-between;align-items:center;padding:12px 16px;border-top:1px dashed var(--pi-border)}.size-table tbody td::before{content:attr(data-label);color:var(--pi-muted);font-weight:600;margin-right:14px}}Nike Youth NFL Jersey Size GuideMeasurements in inches (in.)Nike Youth NFL Jersey Size Guide – measurements in inchesMeasurementSMLXLChest (in.)333639 ½42 ½Waist (in.)333639 ½42 ½Back Length (in.)23252729Pro tips:If layering a tee/hoodie under the jersey, consider sizing up for comfort.Between sizes? Choose the smaller size for a closer fit or the larger size for a roomier fit.