diff --git a/stubs/urllib3/@tests/stubtest_allowlist.txt b/stubs/urllib3/@tests/stubtest_allowlist.txt
index 357586165..e02657772 100644
--- a/stubs/urllib3/@tests/stubtest_allowlist.txt
+++ b/stubs/urllib3/@tests/stubtest_allowlist.txt
@@ -24,10 +24,6 @@ urllib3.connectionpool.HTTPSConnectionPool.__init__
 urllib3.connectionpool.RequestMethods.request_encode_url
 urllib3.connectionpool.VerifiedHTTPSConnection.__init__
 urllib3.connectionpool.VerifiedHTTPSConnection.set_cert
-urllib3.fields.RequestField.__init__
-urllib3.fields.RequestField.from_tuples
-urllib3.filepost.RequestField.__init__
-urllib3.filepost.RequestField.from_tuples
 urllib3.packages.ssl_match_hostname
 urllib3.packages.ssl_match_hostname._implementation
 urllib3.poolmanager.PoolManager.connection_from_host
diff --git a/stubs/urllib3/urllib3/fields.pyi b/stubs/urllib3/urllib3/fields.pyi
index df18769b7..8127d72d6 100644
--- a/stubs/urllib3/urllib3/fields.pyi
+++ b/stubs/urllib3/urllib3/fields.pyi
@@ -1,13 +1,32 @@
-from typing import Any
+from collections.abc import Callable, Mapping
+from typing import Any, Union
+from typing_extensions import TypeAlias
 
-def guess_content_type(filename, default=...): ...
-def format_header_param(name, value): ...
+_FieldValue: TypeAlias = str | bytes
+_FieldValueTuple: TypeAlias = Union[_FieldValue, tuple[str, _FieldValue], tuple[str, _FieldValue, str]]
+
+def guess_content_type(filename: str | None, default: str = ...) -> str: ...
+def format_header_param_rfc2231(name: str, value: _FieldValue) -> str: ...
+def format_header_param_html5(name: str, value: _FieldValue) -> str: ...
+
+format_header_param = format_header_param_html5
 
 class RequestField:
     data: Any
     headers: Any
-    def __init__(self, name, data, filename=..., headers=...) -> None: ...
+    def __init__(
+        self,
+        name: str,
+        data: _FieldValue,
+        filename: str | None = ...,
+        headers: Mapping[str, str] | None = ...,
+        header_formatter: Callable[[str, _FieldValue], str] = ...,
+    ) -> None: ...
     @classmethod
-    def from_tuples(cls, fieldname, value): ...
-    def render_headers(self): ...
-    def make_multipart(self, content_disposition=..., content_type=..., content_location=...): ...
+    def from_tuples(
+        cls, fieldname: str, value: _FieldValueTuple, header_formatter: Callable[[str, _FieldValue], str] = ...
+    ) -> RequestField: ...
+    def render_headers(self) -> str: ...
+    def make_multipart(
+        self, content_disposition: str | None = ..., content_type: str | None = ..., content_location: str | None = ...
+    ) -> None: ...